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Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2018	Jan. 31, 2019	Jun. 30, 2018
Document and Entity Information [Abstract]
Document Type	10-K
Document period end date	Dec. 31, 2018
Amendment flag	false
Document Fiscal Year Focus	2018
Document Period Focus	FY
Current fiscal year end date	--12-31
Entity central index key	0000081362
Entity current reporting status	Yes
Entity filer category	Large Accelerated Filer
Entity registrant name	Quaker Chemical Corporation
Entity voluntary filers	No
Entity well known seasoned issuer	Yes
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity common stock shares outstanding		13,337,601
Entity public float			$ 2,037,718,906
Trading Symbol	KWR

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
Consolidated Statements of Income - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net Sales	$ 867,520	$ 820,082	$ 746,665
Cost of goods sold	555,206	528,587	466,555
Selling, general and administrative expenses	207,872	198,813	193,665
Restructuring and related activities	0	0	(439)
Combination-related expenses	16,661	29,938	1,531
Costs and Expenses, Total	779,739	757,338	661,312
Operating income	87,781	62,744	85,353
Other expense, net	(642)	(718)	(492)
Interest expense	(6,158)	(3,892)	(2,889)
Interest income	2,117	2,534	2,037
Income before taxes and equity in net income of associated companies	83,098	60,668	84,009
Taxes on income before equity in net income of associated companies	25,050	41,653	23,226
Income before equity in net income of associated companies	58,048	19,015	60,783
Equity in net income of associated companies	1,763	3,285	2,256
Net income	59,811	22,300	63,039
Net income attributable to noncontrolling interest	338	2,022	1,636
Net income attributable to Quaker Chemical Corporation	$ 59,473	$ 20,278	$ 61,403
Per share data:
Net income attributable to Quaker Chemical Corporation Common Shareholders - basic	$ 4.46	$ 1.53	$ 4.64
Net income attributable to Quaker Chemical Corporation Common Shareholders - diluted	$ 4.45	$ 1.52	$ 4.63

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement Of Comprehensive Income [Abstract]
Net income	$ 59,811	$ 22,300	$ 63,039
Currency translation adjustments	(17,519)	21,076	(13,772)
Defined Benefit Plans [Abstract]
Net (loss) gain arising during the period, other	1,119	(96)	(2,990)
Amortization of actuarial loss	2,507	2,255	2,155
Amortization of prior service (gain) loss	(84)	(84)	(82)
Unrealized (loss) gain on available-for-sale securities	(1,728)	(130)	537
Other Comprehensive gain (loss)	(15,705)	23,021	(14,152)
Comprehensive Income	44,106	45,321	48,887
Less: comprehensive income attributable to noncontrolling interest	(248)	(2,736)	(1,575)
Comprehensive income attributable to Quaker Chemical Corporation	$ 43,858	$ 42,585	$ 47,312

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 104,147	$ 89,879
Accounts receivable, net	202,139	208,358
Inventories, net	94,090	87,221
Prepaid expenses and other current assets	18,134	21,128
Total current assets	418,510	406,586
Property, plant and equipment, net	83,923	86,704
Goodwill	83,333	86,034
Other intangible assets, net	63,582	71,603
Investments in associated companies	21,316	25,690
Non-current deferred tax assets	6,946	15,460
Other assets	32,055	30,049
Total assets	709,665	722,126
Current liabilities
Short-term borrowings and current portion of long-term debt	670	5,736
Accounts payable	87,819	93,008
Dividends payable	4,935	4,724
Accrued compensation	25,727	22,846
Accrued Pension and Postretirement Benefits, Current	1,211	1,108
Other current liabilities	31,108	27,321
Total current liabilities	151,470	154,743
Long-term debt	35,934	61,068
Non-current deferred tax liabilities	10,003	9,653
Non-current accrued pension and post-retirment benefits	32,360	35,548
Other non-current liabilities	43,529	51,496
Total liabilities	273,296	312,508
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Common stock $1 par value; authorized 30,000,000 shares; issued and outstanding 2018 - 13,338,026 shares; 2017 - 13,307,976 shares	13,338	13,308
Capital in excess of par value	97,304	93,528
Retained earnings	405,125	365,936
Accumulated Other Comprehensive Loss	(80,715)	(65,100)
Total Quaker shareholders equity	435,052	407,672
Noncontrolling interest	1,317	1,946
Total equity	436,369	409,618
Total liabilities and equity	$ 709,665	$ 722,126

Consolidated Balance Sheets (Parentheticals) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Common Stock Par Value	$ 1	$ 1
Common Stock Shares Authorized	30,000,000	30,000,000
Common Stock Shares, Issued	13,338,026	13,307,976

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 59,811	$ 22,300	$ 63,039
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	12,373	12,598	12,557
Amortization	7,341	7,368	7,009
Equity in undistributed earnings of associated companies, net of dividends	2,784	(2,895)	(1,969)
Deferred income taxes	8,197	3,754	5,488
Uncertain tax positions (non-deferred portion)	(89)	(817)	(3,206)
Non-current income taxes payable	(8,181)	15,825	0
Deferred compensation and other, net	2,984	1,074	(424)
Share-based compensation	3,724	4,190	6,349
Restructuring and related activities	0	0	(439)
Loss (gain) on disposal of property, plant and equipment and other assets	(657)	79	(18)
Insurance settlement realized	(1,055)	(762)	(1,023)
Combination related expenses, net of payements	2,727	4,952	503
Pension and other postretirement benefits contributions	(1,392)	(123)	(3,420)
(Decrease) increase in cash from changes in current assets and current liabilities, net of acquisitions:
Accounts receivable	(2,822)	(1,941)	(11,705)
Inventories	(10,548)	(6,135)	(1,870)
Prepaid expenses and other current assets	(1,540)	(2,932)	(703)
Accounts payable and accrued liabilities	190	12,381	14,063
Restructuring liabilities	0	(675)	(5,252)
Estimated taxes on income	4,932	(3,479)	(5,226)
Net cash provided by operating activities	78,779	64,762	73,753
Cash flows from investing activities
Investments in property, plant and equipment	(12,886)	(10,872)	(9,954)
Payments related to acquisitions, net of cash acquired	(500)	(5,363)	(15,024)
Proceeds from disposition of assets	866	1,577	186
Insurance settlement interest earned	162	50	32
Net cash used in investing activities	(12,358)	(14,608)	(24,760)
Cash flows from financing activities
Proceeds from long-term debt	0
Repayment of long-term debt	(26,791)	(2,853)	(14,513)
Dividends paid	(19,319)	(18,613)	(17,625)
Stock options exercised, other	82	(1,956)	(811)
Payments for repurchase of common stock	0	0	(5,859)
Excess tax benefit from stock option exercises	0	0	678
Purchase of noncontrolling interest in affiliates, net	0	(31,787)	0
Distributions to noncontrolling affiliate shareholders	(877)	0	0
Net cash used in financing activities	(46,905)	(55,209)	(38,130)
Effect of exchange rate changes on cash	(6,141)	5,404	(4,089)
Net increase (decrease) in cash, cash equivalents and restricted cash	13,375	349	6,774
Cash, Cash Equivalents and Restricted Cash at the beginning of the period	111,050	110,701	103,927
Cash, Cash Equivalents and Restricted Cash at the end of the period	124,425	111,050	110,701
Supplemental Cash Flow Information [Abstract]
Income Taxes Paid	19,617	21,544	25,043
Interest Paid	2,417	2,767	2,481
Other Noncash Investing And Financing Items [Abstract]
Change in accrued purchases of property, plant and equipment, net	$ 281	$ (240)	$ 363

Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Balance at at Dec. 31, 2015	$ 381,243	$ 13,288	$ 106,333	$ 326,740	$ (73,316)	$ 8,198
Net income	63,039	0	0	61,403	0	1,636
Amounts reported in other comprehensive income (loss)	(14,152)	0	0	0	(14,091)	(61)
Repurchases of common stock	(5,859)	(84)	0	(5,775)	0	0
Dividends common stock	(17,954)	0	0	(17,954)	0	0
Acquisition of noncontrolling interest	73	0	0	0	0	73
Shares issued upon exercise of stock options and other	(1,302)	11	(1,313)	0	0	0
Shares issued for employee stock purchase plan	491	6	485	0	0	0
Equity based compensation plans	6,349	57	6,292	0	0	0
Excess tax benefit from stock option exercises	678	0	678	0	0	0
Balance at at Dec. 31, 2016	412,606	13,278	112,475	364,414	(87,407)	9,846
Net income	22,300	0	0	20,278	0	2,022
Amounts reported in other comprehensive income (loss)	23,021	0	0	0	22,307	714
Dividends common stock	(18,756)	0	0	(18,756)	0	0
Acqusition of noncontrolling interest	(31,787)	0	(21,151)	0	0	(10,636)
Shares issued upon exercise of stock options and other	(2,451)	5	(2,456)	0	0	0
Shares issued for employee stock purchase plan	495	4	491	0	0	0
Equity based compensation plans	4,190	21	4,169	0	0	0
Excess tax benefit from stock option exercises	0	0	0	0	0	0
Balance at at Dec. 31, 2017	409,618	13,308	93,528	365,936	(65,100)	1,946
Net income	59,811	0	0	59,473	0	338
Amounts reported in other comprehensive income (loss)	(15,705)	0	0	0	(15,615)	(90)
Dividends common stock	(19,530)	0	0	(19,530)	0	0
Distributions to noncontrolling affiliate shareholders	(877)	0	0	0	0	(877)
Shares issued upon exercise of stock options and other	(423)	9	(432)	0	0	0
Shares issued for employee stock purchase plan	505	3	502	0	0	0
Equity based compensation plans	3,724	18	3,706	0	0	0
Balance at at Dec. 31, 2018	$ 436,369	$ 13,338	$ 97,304	$ 405,125	$ (80,715)	$ 1,317

Consolidated Statements of Changes in Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Consolidated Statement Of Changes In Equity Parentheticals [Abstract]
Dividends declared	$ 1.465	$ 1.41	$ 1.355

Significant Accounting Policies

12 Months Ended

Dec. 31, 2018

Significant Accounting Policies [Abstract]

Significant Accounting Policies [Text Block]

Note 1 – Significant Accounting Policies

Principles of consolidation: All majority-owned subsidiaries are included in the Company’s consolidated financial statements, with appropriate elimination of intercompany balances and transactions. Investments in associated companies (less than majority-owned and in which the Company has significant influence) are accounted for under the equity method. The Company’s share of net income or losses in these investments in associated companies is included in the Consolidated Statements of Income. The Company periodically reviews these investments for impairments and, if necessary, would adjust these investments to their fair value when a decline in market value or other impairment indicators are deemed to be other than temporary. See Note 16 of Notes to Consolidated Financial Statements. The Company is not the primary beneficiary of any variable interest entities (“VIEs”) and therefore the Company’s consolidated financial statements do not include the accounts of any VIEs.

Translation of foreign currency: Assets and liabilities of non-U.S. subsidiaries and associated companies are translated into U.S. dollars at the respective rates of exchange prevailing at the end of the year. Income and expense accounts are translated at average exchange rates prevailing during the year. Translation adjustments resulting from this process are recorded directly in equity as accumulated other comprehensive (loss) income (“AOCI”) and will be included as income or expense only upon sale or liquidation of the underlying entity or asset. Generally, all of the Company’s non-U.S. subsidiaries use their local currency as their functional currency.

Cash and cash equivalents: The Company invests temporary and excess funds in money market securities and financial instruments having maturities within 90 days. The Company considers all highly liquid investments with original maturities of three months or less to be cash equivalents. The Company has not experienced losses from the aforementioned investments.

Inventories: Inventories are valued at the lower of cost or net realizable value, and are valued using the first-in, first-out method. See Note 13 of Notes to Consolidated Financial Statements.

Long-lived assets: Property, plant and equipment are stated at cost. Depreciation is computed using the straight-line method on an individual asset basis over the following estimated useful lives: buildings and improvements, 10 to 45 years; and machinery and equipment, 1 to 15 years. The carrying values of long-lived assets are evaluated whenever changes in circumstances or current events indicate the carrying amount of such assets may not be recoverable. An estimate of undiscounted cash flows produced by the asset, or the appropriate group of assets, is compared with the carrying value to determine whether an impairment exists. If necessary, the Company recognizes an impairment loss for the difference between the carrying amount of the assets and their estimated fair value. Fair value is based on current and anticipated future cash flows. Upon sale or other dispositions of long-lived assets, the applicable amounts of asset cost and accumulated depreciation are removed from the accounts and the net amount, less proceeds from disposals, is recorded in the Consolidated Statements of Income. Expenditures for renewals or improvements that increase the estimated useful life or capacity of the assets are capitalized, whereas expenditures for repairs and maintenance are expensed when incurred. See Notes 8 and 14 of Notes to Consolidated Financial Statements.

Capitalized software: The Company capitalizes certain costs in connection with developing or obtaining software for internal use, depending on the associated project. These costs are amortized over a period of 3 to 5 years once the assets are ready for their intended use. In connection with the implementations and upgrades to the Company’s global transaction, consolidation and other related systems, approximately $1.1 million and $1.3 million of net costs were capitalized in property, plant and equipment on the Company’s December 31, 2018 and 2017 Consolidated Balance Sheets, respectively.

Goodwill and other intangible assets: The Company records goodwill, definite-lived intangible assets and indefinite-lived intangible assets at fair value at the date of acquisition. Goodwill and indefinite-lived intangible assets are not amortized but tested for impairment at least annually. These tests will be performed more frequently if triggering events indicate potential impairment. Definite-lived intangible assets are amortized over their estimated useful lives, generally for periods ranging from 4 to 20 years. The Company continually evaluates the reasonableness of the useful lives of these assets, consistent with the discussion of long-lived assets, above. See Note 15 of Notes to Consolidated Financial Statements.

Revenue recognition: During the first quarter of 2018, the Company adopted the provisions of the Financial Accounting Standards Board’s (“FASB’s”) revenue recognition guidance which required the Company to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the Company expects to be entitled in exchange for those goods or services. To do this, the Company applies the five-step model in the FASB’s guidance, which requires the Company to: (i) identify the contract with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenue when, or as, the Company satisfies a performance obligation. The Company adopted the new revenue recognition guidance electing to use a modified retrospective adoption approach applied to those contracts which were not completed as of January 1, 2018. Therefore,

comparative information has not been restated and continues to be accounted for and reported under the historical revenue recognition accounting standards in effect for those periods. Prior to this adoption, the Company recognized revenue in accordance with the terms of the underlying agreements, when title and risk of loss had been transferred, when collectability was reasonably assured, and when pricing was fixed or determinable. This generally occurred when products were shipped or delivered to customers or, for consignment-type arrangements, upon usage by the customer and when services were performed. See Notes 3 and 4 of Notes to Consolidated Financial Statements.

Accounts receivable and allowance for doubtful accounts: Trade accounts receivable subject the Company to credit risk. Trade accounts receivable are recorded at the invoiced amount and generally do not bear interest. The allowance for doubtful accounts is the Company’s best estimate of the amount of probable credit losses with its existing accounts receivable. Reserves for customers filing for bankruptcy protection are established based on a percentage of the amount outstanding at the bankruptcy filing date. However, initially establishing a reserve and the amount thereto is dependent on the Company’s evaluation of likely proceeds to be received from the bankruptcy process, which could result in the Company recognizing minimal or no reserve at the date of bankruptcy. Large and/or financially distressed customers are generally reserved for on a specific review basis while a general reserve is established for other customers based on historical experience. The Company performs a formal review of its allowance for doubtful accounts quarterly. Account balances are charged off against the allowance when the Company deems it is probable the receivable will not be recovered. The Company does not have any off-balance-sheet credit exposure related to its customers. See Notes 4 and 12 of Notes to Consolidated Financial Statements.

Research and development costs: Research and development costs are expensed as incurred and are included in selling, general and administrative expenses (“SG&A”). Research and development expenses were $24.5 million, $23.9 million and $22.5 million for the years ended December 31, 2018, 2017 and 2016, respectively.

Environmental liabilities and expenditures: Accruals for environmental matters are recorded when it is probable that a liability has been incurred and the amount of the liability can be reasonably estimated. If there is a range of estimated liability and no amount in that range is considered more probable than another, then the Company records the lowest amount in the range in accordance with generally accepted accounting principles in the United States (“U.S. GAAP”). Accrued liabilities are exclusive of claims against third parties and are not discounted. Environmental costs and remediation costs are capitalized if the costs extend the life, increase the capacity or improve safety or efficiency of the property from the date acquired or constructed, and/or mitigate or prevent contamination in the future. See Note 25 of Notes to Consolidated Financial Statements.

Asset retirement obligations: The Company follows the FASB’s guidance regarding asset retirement obligations, which addresses the accounting and reporting for obligations associated with the retirement of tangible long-lived assets and the associated retirement costs. Also, the Company follows the FASB’s guidance for conditional asset retirement obligations (“CARO”), which relates to legal obligations to perform an asset retirement activity in which the timing and (or) method of settlement are conditional on a future event that may or may not be within the control of the entity. In accordance with this guidance, the Company records a liability when there is enough information regarding the timing of the CARO to perform a probability-weighted discounted cash flow analysis. As of December 31, 2018 and 2017, the Company had limited exposure to such obligations and had immaterial liabilities recorded for such on its Consolidated Balance Sheets.

Pension and other postretirement benefits: The Company maintains various noncontributory retirement plans, the largest of which is in the U.S., covering a portion of its employees in the U.S. and certain other countries. The plans of the Company’s subsidiaries in the Netherlands, the United Kingdom, Mexico and Sweden are subject to the provisions of FASB’s guidance regarding employers’ accounting for defined benefit pension plans. The plans of the remaining non-U.S. subsidiaries are, for the most part, either fully insured or integrated with the local governments’ plans and are not subject to the provisions of the guidance. The guidance requires that employers recognize on a prospective basis the funded status of their defined benefit pension and other postretirement plans on their consolidated balance sheet and, also, recognize as a component of AOCI, net of tax, the gains or losses and prior service costs or credits that arise during the period but are not recognized as components of net periodic benefit cost. In addition, the guidance requires that an employer recognize a settlement charge in their consolidated statement of income when certain events occur, including plan termination or the settlement of certain plan liabilities. A settlement charge represents the immediate recognition into expense of a portion of the unrecognized loss within AOCI on the balance sheet in proportion to the share of the projected benefit obligation that was settled. The Company’s U.S. pension plan year ends on November 30 and the measurement date is December 31. The measurement date for the Company’s other postretirement benefits plan is December 31.

The Company’s global pension investment policies are designed to ensure that pension assets are invested in a manner consistent with meeting the future benefit obligations of the pension plans and maintaining compliance with various laws and regulations including the Employee Retirement Income Security Act of 1974. The Company establishes strategic asset allocation percentage targets and appropriate benchmarks for significant asset classes with the aim of achieving a prudent balance between return and risk. The Company’s investment horizon is generally long term, and, accordingly, the target asset allocations encompass a long-term perspective of capital markets, expected risk and return and perceived future economic conditions while also considering the profile of plan liabilities. To the extent feasible, the short-term investment portfolio is managed to immunize the short-term obligations, the intermediate portfolio duration is immunized to reduce the risk of volatility in intermediate plan distributions, and the total return portfolio is expected to maximize the long-term real growth of plan assets. The critical investment principles of diversification, assessment of risk and targeting the optimal expected returns for given levels of risk are applied. The Company’s investment guidelines prohibit the use of securities such as letter stock and other unregistered securities, commodities or commodity contracts, short sales, margin transactions, private placements (unless specifically addressed by addendum), or any derivatives, options or futures for the purpose of portfolio leveraging.

The target asset allocation is reviewed periodically and is determined based on a long-term projection of capital market outcomes, inflation rates, fixed income yields, returns, volatilities and correlation relationships. The interaction between plan assets and benefit obligations is periodically studied to assist in establishing such strategic asset allocation targets. Asset performance is monitored with an overall expectation that plan assets will meet or exceed benchmark performance over rolling five-year periods. The Company’s pension committee, as authorized by the Company’s Board of Directors, has discretion to manage the assets within established asset allocation ranges approved by senior management of the Company. As of December 31, 2018, the plan’s investments were in compliance with all approved ranges of asset allocations. See Note 20 of Notes to Consolidated Financial Statements.

Comprehensive income (loss): The Company presents other comprehensive income (loss) in its Statements of Comprehensive Income. The Company follows the FASB’s guidance regarding the disclosure of reclassifications from AOCI which requires the disclosure of significant amounts reclassified from each component of AOCI, the related tax amounts and the income statement line items affected by such reclassifications. See Note 22 of Notes to Consolidated Financial Statements.

Income taxes and uncertain tax positions: The provision for income taxes is determined using the asset and liability approach of accounting for income taxes. Under this approach, deferred taxes represent the future tax consequences expected to occur when the reported amounts of assets and liabilities are recovered or paid. The provision for income taxes represents income taxes paid or payable for the current year and the change in deferred taxes during the year. Deferred taxes result from differences between the financial and tax bases of the Company’s assets and liabilities and are adjusted for changes in tax rates and tax laws when changes are enacted. Valuation allowances are recorded to reduce deferred tax assets when it is more likely than not that a tax benefit will not be realized. The FASB’s guidance regarding accounting for uncertainty in income taxes prescribes the recognition threshold and measurement attributes for financial statement recognition and measurement of tax positions taken or expected to be taken on a tax return. The guidance further requires the determination of whether the benefits of tax positions are probable or more likely than not sustained upon audit based upon the technical merits of the tax position. For tax positions that are determined to be more likely than not sustained upon audit, a company recognizes the largest amount of benefit that is greater than 50% likely of being realized upon ultimate settlement in the financial statements. For tax positions that are not determined to be more likely than not sustained upon audit, a company does not recognize any portion of the benefit in the financial statements. Additionally, the Company monitors and adjusts for derecognition, classification, and penalties and interest in interim periods, with appropriate disclosure and transition thereto. Also, the amount of interest expense and income related to uncertain tax positions is computed by applying the applicable statutory rate of interest to the difference between the tax position recognized, including timing differences, and the amount previously taken or expected to be taken in a tax return. The Company’s continuing practice is to recognize interest and/or penalties related to income tax matters in income tax expense. Finally, when applicable, the Company nets its liability for unrecognized tax benefits against deferred tax assets related to net operating losses or other tax credit carryforwards that would apply if the uncertain tax position were settled for the presumed amount at the balance sheet date.

Pursuant to the Tax Cuts and Jobs Act (“U.S. Tax Reform”), specifically the one-time tax on deemed repatriation (the “Transition Tax”), the Company has provided for U.S. income tax on its undistributed earnings of non-U.S. subsidiaries, however, the Company is subject to and will incur other taxes, such as withholding taxes and dividend distribution taxes, if these undistributed earnings were ultimately remitted to the U.S. It is the Company’s current intention to reinvest its future undistributed earnings of non-U.S. subsidiaries to support working capital needs and certain other growth initiatives. However, in certain cases the Company has and may in the future change its indefinite reinvestment assertion for any or all of these undistributed earnings. In this case, the Company would estimate and record a tax liability and corresponding tax expense for the amount of non-U.S. income taxes it will incur to ultimately remit these earnings to the U.S. See Note 9 of Notes to Consolidated Financial Statements.

Derivatives: The Company is exposed to the impact of changes in interest rates, foreign currency fluctuations, changes in commodity prices and credit risk. The Company is currently not using derivative instruments to mitigate the risks associated with foreign currency fluctuations, changes in commodity prices or credit risk, but has used derivative financial instruments primarily for purposes of hedging exposures to fluctuations in interest rates in the past. If used in the future, the Company will recognize the entire change in the fair value of the hedging instrument in the same income statement line as the hedged item. The Company currently uses no derivative instruments designated as hedges and, also, has not entered into derivative contracts for trading or speculative purposes.

Fair value measurements: The Company utilizes the FASB’s guidance regarding fair value measurements, which establishes a common definition for fair value to be applied to guidance requiring use of fair value, establishes a framework for measuring fair value and expands disclosure about such fair value measurements. Specifically, the guidance utilizes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels. See Notes 20 and 24 of Notes to Consolidated Financial Statements. The following is a brief description of those three levels:

	•	Level 1: Observable inputs such as quoted prices (unadjusted) in active markets for identical assets or liabilities.
	•	Level 2: Inputs other than quoted prices that are observable for the asset or liability, either directly or indirectly. These include quoted prices for similar assets or liabilities in active markets and quoted prices for identical or similar assets or liabilities in markets that are not active.
	•	Level 3: Unobservable inputs that reflect the reporting entity's own assumptions.

Share-based compensation: The Company applies the FASB’s guidance regarding share-based payments, which requires the recognition of the fair value of share-based compensation as a component of expense. The Company has a long-term incentive program (“LTIP”) for key employees which provides for the granting of options to purchase stock at prices not less than its market value on the date of the grant. Most options become exercisable between one and three years after the date of the grant for a period of time determined by the Company, but not to exceed seven years from the date of grant. Restricted stock awards and restricted stock units issued under the LTIP program are generally subject to time vesting over a one to four-year period. In addition, as part of the Company’s Global Annual Incentive Plan, nonvested shares may be issued to key employees, which generally vest over a two to five-year period. In addition, while the FASB’s guidance permits the Company to make an accounting policy election to account for forfeitures as they occur for service condition aspects of certain share-based awards, the Company has decided not to elect this accounting policy and instead has elected to continue utilizing a forfeiture rate assumption. Based on historical experience, the Company has assumed a forfeiture rate of 13% on certain of its nonvested stock awards. The Company will record additional expense if the actual forfeiture rate is lower than estimated and will record a recovery of prior expense if the actual forfeiture is higher than estimated. See Note 7 of Notes to Consolidated Financial Statements.

Earnings per share: The Company follows the FASB’s guidance regarding the calculation of earnings per share for nonvested stock awards with rights to non-forfeitable dividends. The guidance requires nonvested stock awards with rights to non-forfeitable dividends to be included as part of the basic weighted average share calculation under the two-class method. See Note 10 of Notes to Consolidated Financial Statements.

Segments: The Company’s operating segments reflect the structure of the Company’s internal organization, the method by which the Company’s resources are allocated and the manner by which the Company assesses its performance. The Company’s operating segments are organized by geography as follows: (i) North America, (ii) Europe, Middle East and Africa (“EMEA”), (iii) Asia/Pacific and (iv) South America. The Company’s reportable segments are the same as the Company’s operating segments. See Note 5 of Notes to Consolidated Financial Statements.

Hyper-inflationary accounting: Economies that have a cumulative three-year rate of inflation exceeding 100 percent are considered hyper-inflationary in accordance with U.S. GAAP. A legal entity which operates within an economy deemed to be hyper-inflationary is required to remeasure its monetary assets and liabilities to the applicable published exchange rates and record the associated gains or losses resulting from the remeasurement directly to the Consolidated Statements of Income.

Venezuela’s economy has been considered hyper-inflationary under U.S. GAAP since 2010. The Company has a 50-50 joint venture in a Venezuelan affiliate, Kelko Quaker Chemical, S.A (“Kelko Venezuela”). Due to heightened foreign exchange controls, current economic circumstances and other restrictions in Venezuela, during the third quarter of 2018 the Company concluded that it no longer had significant influence over this affiliate. Prior to this determination, the Company historically accounted for this affiliate under the equity method. As of December 31, 2018, the Company has no remaining carrying value for its investment in Kelko Venezuela. See Note 16 of Notes to Consolidated Financial Statements.

Based on various indices or index compilations currently being used to monitor inflation in Argentina as well as recent economic instability, effective July 1, 2018, Argentina’s economy was considered hyper-inflationary under U.S. GAAP. As a result, the Company began applying hyper-inflationary accounting with respect to the Company's wholly owned Argentina subsidiary beginning July 1, 2018. As of, and for the year ended December 31, 2018, the Company's Argentina subsidiary represented less than 1% of the Company’s consolidated total assets and less than 1% of the Company’s consolidated net sales. During the years ended December 31, 2018, 2017 and 2016, the Company recorded $0.7 million, $0.4 million, and $0.1 million, respectively, of hyper-inflationary accounting remeasurement losses associated with the applicable currency conversions related to Venezuela and Argentina.

Business combinations: The Company accounts for business combinations under the acquisition method of accounting. This method requires the recording of acquired assets, including separately identifiable intangible assets and assumed liabilities at their respective acquisition date estimated fair values. Any excess of the purchase price over the estimated fair value of the identifiable net assets acquired is recorded as goodwill. The determination of the estimated fair value of assets acquired and liabilities assumed requires significant estimates and assumptions. Based on the assessment of additional information during the measurement period, which may be up to one year from the acquisition date, the Company may record adjustments to the estimated fair value of assets acquired and liabilities assumed. See Note 23 of Notes to Consolidated Financial Statements.

Restructuring activities: Restructuring programs consist of employee severance, rationalization of manufacturing or other facilities and other related items. To account for such programs, the Company applies FASB’s guidance regarding exit or disposal cost obligations. This guidance requires that a liability for a cost associated with an exit or disposal activity be recognized when the liability is incurred, is estimable, and payment is probable. See Note 6 of Notes to Consolidated Financial Statements.

Reclassifications: Certain information has been reclassified to conform to the current year presentation. During the first quarter of 2018, the Company adopted guidance regarding the accounting for and disclosure of net sales and revenue recognition. The Company’s adoption, using the modified retrospective adoption approach, resulted in certain adjustments as of January 1, 2018. In addition, during the first quarter of 2018, the Company adopted an accounting standard update requiring that the statement of cash flows explain both the change in total cash and cash equivalents and also the amounts generally described as restricted cash or restricted cash equivalents. The guidance in this accounting standard update was required to be applied retrospectively which resulted in certain adjustments to the Company’s Consolidated Statement of Cash Flows for the year ended December 31, 2017 and 2016. See Notes 3, 4 and 11 of Notes to Consolidated Financial Statements.

Accounting estimates: The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities and disclosure of contingencies at the date of the financial statements and the reported amounts of net sales and expenses during the reporting period. Actual results could differ from such estimates.

Houghton Combination	12 Months Ended
Houghton Combination	Dec. 31, 2018
Business Combination Separately Recognized Transactions [Abstract]
Business Combination Separately Recognized Transactions [Table Text Block]	Note 2 – Houghton Combination In April 2017, Quaker entered into a share purchase agreement with Gulf Houghton Lubricants, Ltd. to purchase the entire issued and outstanding share capital of Houghton International, Inc. (“Houghton”) (herein referred to as “the Combination”). The shares will be bought for aggregate purchase consideration consisting of: (i) $172.5 million in cash; (ii) a number of shares of common stock, $1.00 par value per share, of the Company comprising 24.5% of the common stock outstanding upon the closing of the Combination; and (iii) the Company’s assumption of Houghton’s net indebtedness as of the closing of the Combination, which was approximately $690 million at signing. At closing, the total aggregate purchase consideration is dependent on the Company’s stock price and the level of Houghton’s indebtedness. The Company secured $1.15 billion in commitments from Bank of America Merrill Lynch and Deutsche Bank to fund the Combination and to provide additional liquidity, and has since replaced these commitments with a syndicated bank agreement (“the New Credit Facility”) with a group of lenders for $1.15 billion. The New Credit Facility is contingent upon and will not be effective until the closing of the Combination. During the fourth quarter of 2018, the Company extended the bank commitment for the New Credit Facility through March 15, 2019. The New Credit Facility is comprised of a $400.0 million multicurrency revolver, a $600.0 million USD term loan and a $150.0 million EUR equivalent term loan, each with a five-year term from the date the New Credit Facility becomes effective. The maximum amount available under the New Credit Facility can be increased by $200.0 million at the Company’s option if the lenders agree and the Company satisfies certain conditions. Borrowings under the New Credit Facility will bear interest at a base rate, LIBOR rate plus a margin, or Euribor rate plus a margin. The Company currently estimates the annual floating rate cost will be in the 3.75% to 4.0% range based on current market interest rates. The New Credit Facility will be subject to certain financial and other covenants, including covenants that the Company’s consolidated net debt to adjusted EBITDA ratio cannot exceed 4.25 to 1 and the Company’s consolidated adjusted EBITDA to interest expense ratio cannot be less than 3.0 to 1. Both the USD and EUR equivalent term loans will have quarterly principal amortization during their respective five-year terms, with 5.0% amortization of the principal balance due in years 1 and 2, 7.5% in year 3, and 10.0% in years 4 and 5, with the remaining principal amounts due at maturity. Until closing, the Company will incur certain interest costs paid to maintain the bank commitment (“ticking fees”), which began to accrue on September 29, 2017 and bear an interest rate of 0.30% per annum. The Company received regulatory approval for the Combination from China and Australia in 2017. In addition, at a shareholder meeting held during 2017, the Company’s shareholders overwhelmingly approved the issuance of the new shares of the Company’s common stock at closing of the Combination. The European Commission (“EC”) conditionally approved the Combination in December 2018, including the remedy proposed by Quaker and Houghton. The Company expects final approval from the EC once the final purchase agreement is in place between Quaker, Houghton, and the buyer of the divested product lines. The Company continues to be in productive discussions with the U.S. Federal Trade Commission (“FTC”), although the process is taking longer than anticipated. Given the time lapse since the Company’s initial filing, the FTC requested updated information as part of their approval process late in the fourth quarter of 2018. In addition, the government shutdown in the U.S. during the first quarter of 2019 extended the timeline to receive the final approval. Given current information, the Company estimates that FTC and EC final approval and closing of the combination will occur within the next few months. The Company incurred costs of $19.5 million, $30.8 million and $1.5 million during the years ended December 31, 2018, 2017 and 2016, respectively, primarily for certain legal, environmental, financial, and other advisory and consultant costs related to due diligence, regulatory and shareholder approvals, integration planning associated with the Combination and ticking fees. As of December 31, 2018 and 2017, the Company had current liabilities related to the Combination of $8.2 million and $5.5 million, respectively, primarily recorded within other current liabilities on its Consolidated Balance Sheets.

Recently Issued Accounting Standards	12 Months Ended
Recently Issued Accounting Standards	Dec. 31, 2018
New Accounting Pronouncements And Changes In Accounting Principles [Abstract]
Description Of New Accounting Pronouncements Not Yet Adopted [Text Block]	Note 3 – Recently Issued Accounting Standards The FASB issued an accounting standard update in October 2018 to provide guidance on the risks associated with financial assets and liabilities that are permitted to be hedged. The amendments in this update permit use of the Overnight Index Swap (“OIS”) rate based on the Secured Overnight Financing Rate (SOFR) as a U.S. benchmark interest rate in addition to the other four rates: interest rates on direct Treasury obligations of the U.S. government (UST), the London Interbank Offered Rate (LIBOR) swap rate, the OIS rate based on the Fed Funds Effective Rate and the Securities Industry and Financial Markets Association (SIFMA) Municipal Swap Rate. The amendments in this update also apply to all entities that elect to apply hedge accounting to benchmark interest rate hedges. The guidance within this accounting standard update is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. The amendments in this update should be adopted on a prospective basis for qualifying new or re-designated hedging relationships entered into on or after the date of adoption. Early adoption is permitted. The Company has elected to early adopt the guidance in this accounting standard update during the fourth quarter of 2018, with no impact to its financial statements. The Company does not currently use any derivative instruments designated as hedges but may choose to in the future. The FASB issued an accounting standard update in August 2018 that modifies certain disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The amendments in this accounting standard update remove disclosures that are no longer considered cost beneficial, clarify the specific requirements of certain disclosures, and add new disclosure requirements as relevant. The guidance within this accounting standard update is effective for annual periods beginning after December 15, 2020, and should be applied retrospectively to all periods presented. Early adoption is permitted. The Company has not early adopted the guidance and is currently evaluating its implementation. The FASB issued an accounting standard update in August 2018 that clarifies the accounting for implementation costs incurred in a cloud computing arrangement under a service contract. This guidance generally aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement under a service contract with the requirements for capitalizing implementation costs related to internal-use software. The guidance within this accounting standard update is effective for annual periods beginning after December 15, 2019 and should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. Early adoption is permitted. The Company has not early adopted the guidance and is currently evaluating its implementation. The FASB issued an accounting standard update in August 2018 that modifies certain disclosure requirements for fair value measurements. The guidance removes certain disclosure requirements regarding transfers between levels of the fair value hierarchy as well as the valuation processes for certain fair value measurements. Further, the guidance added certain disclosure requirements including unrealized gains and losses and significant unobservable inputs used to develop certain fair value measurements. The guidance within this accounting standard update is effective for annual and interim periods beginning after December 15, 2019, and should be applied prospectively in the initial year of adoption or prospectively to all periods presented, depending on the amended disclosure requirement. Early adoption is permitted. The Company has not early adopted the guidance and is currently evaluating its implementation. The FASB issued an accounting standard update in June 2018 to simplify the accounting for share-based payment transactions with non-employees of the Company. The guidance within this accounting standard update generally requires that share-based payment transactions for acquiring goods or services from non-employees of the Company be accounted for under the same guidance and model as all other share-based payment transactions, including employees of the Company. The guidance within this accounting standard update is effective for annual and interim periods beginning after December 15, 2018. Early adoption is permitted. The Company elected to early adopt the guidance within this accounting standard updated in the second quarter of 2018 with no impact to its financial statements. The FASB issued an accounting standard update in February 2018 that allows a reclassification from AOCI to retained earnings for stranded tax effects resulting from U.S. Tax Reform enacted in December 2017. The guidance within this accounting standard update is effective for annual and interim periods beginning after December 15, 2018, and should be applied either in the period of adoption or retrospectively to each period in which the effect of the change in the U.S. federal corporate income tax rate in U.S. Tax Reform is recognized. Early adoption is permitted. The Company has not early adopted the guidance and is currently evaluating its implementation. The FASB issued an accounting standard update in January 2017 to clarify the definition of a business with the objective of adding guidance to assist companies with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The amendments in this accounting standard update provided a more robust framework to use in determining when a set of assets and activities is a business. The guidance within this accounting standard update was effective for annual and interim periods beginning after December 15, 2017. Early adoption was permitted in limited circumstances, and the amendments in this accounting standard update were required to be applied prospectively, with no disclosures required at transition. The Company adopted the guidance in the first quarter of 2018, as required, with no impact to its financial statements. The FASB issued an accounting standard update in November 2016 requiring that the statement of cash flows explain both the change in the total cash and cash equivalents, and also the amounts generally described as restricted cash or restricted cash equivalents. This required amounts generally described as restricted cash or restricted cash equivalents be included with cash and cash equivalents when reconciling the beginning and ending amounts shown on the statement of cash flows. The guidance within this accounting standard update was effective for annual and interim periods beginning after December 15, 2017. Early adoption was permitted, and the guidance required application using a retrospective transition method to each period presented when adopted. The Company adopted the guidance in the first quarter of 2018, as required. Adoption of the guidance did not have an impact on the Company’s earnings or balance sheet but did result in changes to certain disclosures within the statement of cash flows, including cash flows from investing activities and total cash, cash equivalents and restricted cash. See Note 11 of Notes to Consolidated Financial Statements. The FASB issued an accounting standard update in October 2016 to improve the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. The provisions in this update allowed an entity to recognize current and deferred income taxes of an intra-entity transfer of an asset other than inventory when the transfer occurs rather than when the asset has been sold to an outside party. The guidance within this accounting standard update was effective for annual and interim periods beginning after December 15, 2017. Early adoption was permitted, and the guidance required application on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. The Company adopted the guidance in the first quarter of 2018, as required, with no impact to its financial statements. The FASB issued an accounting standard update in August 2016 to standardize how certain transactions are classified in the statement of cash flows. Specific transactions covered by the accounting standard update include debt prepayment or debt extinguishment costs, settlement of zero-coupon debt instruments, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate and bank owned life insurance policies, distributions received from equity method investments and beneficial interest in securitization transactions. The guidance within this accounting standard update was effective for annual and interim periods beginning after December 15, 2017. Early adoption was permitted, provided that all of the amendments were adopted in the same period. The guidance required application using a retrospective transition method. The Company adopted the guidance in the first quarter of 2018 as required, with no impact to its financial statements. The FASB issued an accounting standard update in February 2016 regarding the accounting and disclosure for leases. During 2018, the FASB issued a series of accounting standard updates to clarify and expand on the original 2016 implementation guidance, including providing an accounting policy election for lessors, certain targeted improvements around comparative reporting requirements and accounting for lease and non-lease components by lessors as well as other technical corrections and improvements. The amendments in these 2018 updates did not change the core principles of the guidance previously issued in February 2016. The guidance within all of the leasing accounting standard updates are effective for annual and interim periods beginning after December 15, 2018, and should be applied on a modified retrospective basis, applying the transition requirements either (a) at the beginning of the earliest period presented in the financial statements in the year of adoption (January 1, 2017) or (b) in the period of adoption (January 1, 2019). Early adoption is permitted, but the Company has not early adopted. The Company will adopt the guidance in the first quarter of 2019, as required, using a modified retrospective transition approach. The Company will apply the transition requirements in the period of adoption (as of January 1, 2019), as permitted. As such the Company will neither restate comparative periods for the effects of this lease accounting guidance or provide the disclosures requirements for comparative periods. The Company anticipates electing to apply certain of the permitted practical expedients within the new lease accounting guidance, and the Company also anticipates making certain accounting policy elections as a result of adopting the new lease accounting guidance. As of December 31, 2018, the Company has substantially completed its implementation planning and its impact assessment related to the new lease accounting guidance. Work performed to date includes developing a detailed project plan, identifying and establishing a cross-functional implementation team and developing pre-adoption internal controls. In addition, the Company gathered an inventory of the Company’s explicit outstanding leases globally, performed certain review procedures to ensure completeness of its lease population and abstracted critical lease information from the lease population for inclusion within the Company’s leasing software. Also, the Company has begun preliminary considerations for how the new lease accounting guidance may impact Houghton, as it pertains to the potential Combination. The Company has calculated a preliminary transition adjustment which will be finalized and reflected in the Company’s financial statements starting after the effective date of January 1, 2019. While the Company’s implementation of this lease accounting guidance is still on-going, the Company anticipates adoption of this guidance will have a material impact on its balance sheet as it expects the majority of its leases will be recorded on its balance sheet by establishing right of use assets and associated lease liabilities. Based on all current available information, the Company estimates that its right of use assets and associated lease liabilities will be approximately $20 million to $30 million as of January 1, 2019. The FASB issued an accounting standard update in May 2014 regarding the accounting for and disclosure of revenue recognition. Specifically, the update outlined a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers, which will be common to both U.S. GAAP and International Financial Reporting Standards. The guidance was effective for annual and interim periods beginning after December 15, 2016, and allowed for full retrospective adoption of prior period data or a modified retrospective adoption. Early adoption was not permitted. In August 2015, the FASB issued an accounting standard update to delay the effective date of the new revenue standard by one year, or, in other words, to be effective for annual and interim periods beginning after December 15, 2017. Entities were permitted to adopt the new revenue standard early but not before the original effective date. During 2016 and 2017, the FASB issued a series of accounting standard updates to clarify and expand on the implementation guidance, including principal versus agent considerations, identification of performance obligations, licensing, other technical corrections and adding certain practical expedients. The amendments in these 2016 and 2017 updates did not change the core principles of the guidance previously issued in May 2014. As part of the Company’s impact assessment for the implementation of the new revenue recognition guidance, the Company reviewed its historical accounting policies and practices to identify potential differences with the requirements of the new revenue recognition standard as it related to the Company’s contracts and sales arrangements. In addition, the impact assessment and work performed included global and cross functional interviews and questionnaires, sales agreement and other sales document reviews, as well as technical considerations for the Company’s future transactional accounting, financial reporting and disclosure requirements. The Company has also progressed its assessment of how the new revenue recognition guidance may impact Houghton, as it pertains to the pending Combination. The Company adopted the guidance in the first quarter of 2018 as required, electing to use a modified retrospective adoption approach applied to those contracts which were not completed as of January 1, 2018. Comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. In addition, the Company elected to apply certain of the permitted practical expedients within the revenue recognition guidance and make certain accounting policy elections including those related to significant financing components, sales taxes and shipping and handling activities. Adoption of the revenue recognition guidance did not have a material impact on the Company’s reported earnings or cash flows, however, adoption did increase the amount and level of disclosures concerning the Company’s net sales and did result in one adjustment to the Company’s balance sheet. As a result of the Company’s impact assessment and adoption using the modified retrospective adoption approach, the Company recorded a cumulative effect of an accounting change as of January 1, 2018 to adjust the Company’s estimate of variable consideration relating to customers’ expected rights to return product. This adjustment resulted in an increase to other current liabilities of $1.0 million, an increase to non-current deferred tax assets of $0.2 million and a decrease to retained earnings of $0.8 million. There were no other impacts recorded as a result of adopting the revenue recognition guidance in 2018 or prior years and the Company expects the impact to be immaterial on an ongoing basis. See Note 4 and 18 of Notes to Consolidated Financial Statements.

Net Sales and Revenue Recognition

12 Months Ended

Dec. 31, 2018

Revenue From Contract With Customer [Abstract]

Revenue From Contract With Customer [TextBlock]

Note 4 – Net Sales and Revenue Recognition

Business Description

The Company develops, produces, and markets a broad range of formulated chemical specialty products and offers chemical management services (“CMS”) for various heavy industrial and manufacturing applications in a global portfolio throughout its four regions: North America, EMEA, Asia/Pacific and South America. The major product lines in the Company’s global portfolio include: (i) rolling lubricants (used by manufacturers of steel in the hot and cold rolling of steel and by manufacturers of aluminum in the hot rolling of aluminum); (ii) machining and grinding compounds (used by metalworking customers in cutting, shaping, and grinding metal parts which require special treatment to enable them to tolerate the manufacturing process, achieve closer tolerance, and improve tool life); (iii) corrosion preventives (used by steel and metalworking customers to protect metal during manufacture, storage, and shipment); (iv) hydraulic fluids (used by steel, metalworking, and other customers to operate hydraulic equipment); (v) specialty greases (used in automotive and aerospace production processes and applications, the manufacturing of steel, and various other applications); and (vi) metal finishing compounds (used to prepare metal surfaces for special treatments such as galvanizing and tin plating and to prepare metal for further processing).

A substantial portion of the Company’s sales worldwide are made directly through its own employees and its CMS programs, with the balance being handled through distributors and agents. The Company’s employees visit the plants of customers regularly, work on site, and, through training and experience, identify production needs which can be resolved or alleviated either by adapting the Company’s existing products or by applying new formulations developed in its laboratories. The chemical specialty industry comprises many companies of similar size as well as companies larger and smaller than Quaker. The offerings of many of the Company’s competitors differ from those of Quaker; some offer a broad portfolio of fluids, including general lubricants, while others have a more specialized product range. All competitors provide different levels of technical services to individual customers. Competition in the industry is based primarily on the ability to provide products that meet the needs of the customer, render technical services and laboratory assistance to the customer and, to a lesser extent, on price.

As part of the Company’s CMS, certain third-party product sales to customers are managed by the Company. Where the Company acts as a principal, revenues are recognized on a gross reporting basis at the selling price negotiated with its customers. Where the Company acts as an agent, revenue is generally recognized on a net reporting basis at the amount of the administrative fee earned by the Company for ordering the goods. In determining whether the Company is acting as a principal or an agent in each arrangement, the Company considers whether it is primarily responsible for fulfilling the promise to provide the specified good, has inventory risk before the specified good has been transferred to the customer and has discretion in establishing the prices for the specified goods. The Company transferred third-party products under arrangements resulting in net reporting of $47.1 million, $44.5 million and $43.5 million for the years ended December 31, 2018, 2017 and 2016.

A significant portion of the Company’s revenues are realized from the sale of process fluids and services to manufacturers of steel, automobiles, aircraft, appliances, and durable goods, and, therefore, the Company is subject to the same business cycles as those experienced by these manufacturers and their customers. The Company’s financial performance is generally correlated to the volume of global production within the industries it serves, rather than discretely related to the financial performance of such industries. Furthermore, steel customers typically have limited manufacturing locations compared to other metalworking customers and generally use higher volumes of products at a single location. During the year ended December 31, 2018, the Company’s five largest customers accounted for approximately 17% of its consolidated net sales with the largest customer accounting for approximately 8% of the Company’s consolidated net sales.

Revenue Recognition Model

The Company applies the FASB’s guidance on revenue recognition which requires the Company to recognize revenue in an amount that reflects the consideration to which the Company expects to be entitled in exchange for goods or services transferred to its customers. To do this, the Company applies the five-step model in the FASB’s guidance, which requires the Company to: (i) identify the contract with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenue when, or as, the Company satisfies a performance obligation.

The Company identifies a contract with a customer when a sales agreement indicates approval and commitment of the parties; identifies the rights of the parties; identifies the payment terms; has commercial substance; and it is probable that the Company will collect the consideration to which it will be entitled in exchange for the goods or services that will be transferred to the customer. In most instances, the Company’s contract with a customer is the customer’s purchase order. For certain customers, the Company may also enter into a sales agreement which outlines a framework of terms and conditions which apply to all future and subsequent purchase orders for that customer. In these situations, the Company’s contract with the customer is both the sales agreement as well as the specific customer purchase order. Because the Company’s contract with a customer is typically for a single transaction or customer purchase order, the duration of the contract is almost always one year or less. As a result, the Company has elected to apply certain practical expedients and omit certain disclosures of remaining performance obligations for contracts which have an initial term of one year or less as permitted by the FASB.

The Company identifies a performance obligation in a contract for each promised good or service that is separately identifiable from other promises in the contract and for which the customer can benefit from the good or service either on its own or together with other resources that are readily available to the customer. The Company determines the transaction price as the amount of consideration it expects to be entitled to in exchange for fulfilling the performance obligations, including the effects of any variable consideration, significant financing elements, amounts payable to the customer or noncash consideration. For any contracts that have more than one performance obligation, the Company allocates the transaction price to each performance obligation in an amount that depicts the amount of consideration to which the Company expects to be entitled in exchange for satisfying each performance obligation.

In accordance with the last step of the FASB’s guidance, the Company recognizes revenue when, or as, it satisfies the performance obligation in a contract by transferring control of a promised good or service to the customer. The Company recognizes revenue over time whenever the customer simultaneously receives and consumes the benefits provided by the Company’s performance; the Company’s performance creates or enhances an asset that the customer controls as the asset is created or enhanced; or the Company’s performance does not create an asset with an alternative use to the entity, and the entity has an enforceable right to payment, including a profit margin, for performance completed to date. For performance obligations not satisfied over time, the Company determines the point in time at which a customer obtains control of a promised asset and the Company satisfies a performance obligation by considering when the Company has a right to payment for the asset; the customer has legal title to the asset; the Company has transferred physical possession of the asset; the customer has the significant risks and rewards of ownership of the asset; or the customer has accepted the asset.

The Company typically satisfies its performance obligations and recognizes revenue at a point in time for product sales, generally when products are shipped or delivered to the customer, depending on the terms underlying each arrangement. In circumstances where the Company’s products are on consignment, revenue is generally recognized upon usage or consumption by the customer. For any CMS or other services provided by the Company to the customer, the Company typically satisfies its performance obligations and recognizes revenue over time, as the promised services are performed. The Company uses input methods to recognize revenue over time related to these services, including labor costs and time incurred. The Company believes that these input methods represent the most indicative measure of the CMS or other service work performed by the Company.

Other Considerations

The Company does not have standard payment terms for all customers globally, however the Company’s general payment terms require customers to pay for products or services provided after the performance obligation is satisfied. The Company does not have significant financing arrangements with its customers. The Company does not have significant amounts of variable consideration in its contracts with customers and where applicable, the Company’s estimates of variable consideration are not constrained. The Company records certain third-party license fees in other expense, net, in its Consolidated Statement of Income, which generally include sales-based royalties in exchange for the license of intellectual property. These license fees are recognized in accordance with their agreed-upon terms and when performance obligations are satisfied, which is generally when the third party has a subsequent sale.

Practical Expedients and Accounting Policy Elections

The Company made certain accounting policy elections and elected to use certain practical expedients as permitted by the FASB in applying the guidance on revenue recognition. It is the Company’s policy to not adjust the promised amount of consideration for the effects of a significant financing component as the Company expects, at contract inception, that the period between when the Company transfers a promised good or service to the customer and when the customer pays for that good or service will be one year or less. In addition, it is the Company’s policy to expense costs to obtain a contract as incurred when the expected period of benefit, and therefore the amortization period, is one year or less. It is also the Company’s accounting policy to exclude from the measurement of the transaction price all taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction and collected by the entity from a customer, including sales, use, value added, excise and various other taxes. Lastly, the Company has elected to account for shipping and handling activities that occur after the customer has obtained control of a good as a fulfilment cost rather than an additional promised service.

Contract Assets and Liabilities

The Company recognizes a contract asset or receivable on its Consolidated Balance Sheet when the Company performs a service or transfers a good in advance of receiving consideration. A receivable is the Company’s right to consideration that is unconditional and only the passage of time is required before payment of that consideration is due. A contract asset is the Company’s right to consideration in exchange for goods or services that the Company has transferred to a customer. The Company had no contract assets recorded on its Consolidated Balance Sheets as of December 31, 2018 or 2017.

A contract liability is recognized when the Company receives consideration, or if it has the unconditional right to receive consideration, in advance of performance. A contract liability is the Company’s obligation to transfer goods or services to a customer for which the Company has received consideration, or a specified amount of consideration is due, from the customer. The Company’s contract liabilities primarily represent deferred revenue recorded for customer payments received by the Company prior to the Company satisfying the associated performance obligation. Deferred revenues are presented within other current liabilities in the Company’s Consolidated Balance Sheets. The Company had approximately $1.3 million and $1.5 million of deferred revenue as of December 31, 2018 and 2017, respectively. During the year ended December 31, 2018, the Company satisfied all of the associated performance obligations and recognized into revenue the advance customer payments received and recorded as of December 31, 2017.

Disaggregated Revenue

The Company sells its various industrial process fluids, its chemical specialties and its technical expertise as a global product portfolio. The Company generally manages and evaluates its performance by geography first, and then by customer industry, rather than by individual product lines. Also, net sales of each of the Company’s major product lines are generally spread throughout all four of the Company’s regions, and, in most cases, are relatively proportionate to the level of total sales in each region.

The following tables present disaggregated information regarding the Company’s net sales, first by product lines that represent approximately 10% of consolidated net sales for any of the years ended December 31, 2018, 2017 and 2016, and followed then by a disaggregation of the Company’s net sales by region, customer industry, and timing of revenue recognized for the year ended December 31, 2018.

	2018		2017		2016
Rolling lubricants	16.9	%	17.8	%	19.0	%
Machining and grinding compounds	16.1	%	15.8	%	14.9	%
Corrosion preventives	11.6	%	11.4	%	11.8	%
Hydraulic fluids	11.4	%	11.6	%	12.0	%
Specialty greases	9.7	%	10.0	%	10.1	%

	2018
	North						South		Consolidated
	America		EMEA		Asia/Pacific		America		Total
Net sales	$	383,471	$	233,597	$	214,157	$	36,295	$	867,520

Customer Industries
Primary metals	$	156,906	$	102,417	$	134,395	$	19,818	$	413,536
Metalworking		167,829		116,076		74,867		14,827		373,599
Coatings and other		58,736		15,104		4,895		1,650		80,385
	$	383,471	$	233,597	$	214,157	$	36,295	$	867,520

Timing of Revenue Recognized
Product sales at a point in time	$	372,392	$	233,372	$	206,112	$	36,010	$	847,886
Services transferred over time		11,079		225		8,045		285		19,634
	$	383,471	$	233,597	$	214,157	$	36,295	$	867,520

Business Segments

12 Months Ended

Dec. 31, 2018

Segment Disclosures [Abstract]

Segment Reporting Disclosure [Text Block]

Note 5 – Business Segments

The Company’s reportable operating segments are organized by geography as follows: (i) North America, (ii) EMEA, (iii) Asia/Pacific and (iv) South America. Operating earnings, excluding indirect operating expenses, for the Company’s reportable operating segments is comprised of revenues less cost of goods sold (“COGS”) and SG&A directly related to the respective region’s product sales. The indirect operating expenses consist of SG&A not directly attributable to the product sales of each respective reportable operating segment. Other items not specifically identified with the Company’s reportable operating segments include interest expense, interest income, license fees from non-consolidated affiliates, amortization expense and other expense, net.

The following tables present information about the performance of the Company’s reportable operating segments for the years ended December 31, 2018, 2017 and 2016:

		2018		2017		2016
Net sales
	North America	$	383,471	$	356,598	$	336,174
	EMEA		233,597		226,243		200,917
	Asia/Pacific		214,157		201,008		179,131
	South America		36,295		36,233		30,443
Total net sales		$	867,520	$	820,082	$	746,665

		2018		2017		2016
Operating earnings, excluding indirect operating expenses
	North America	$	88,276	$	77,694	$	77,833
	EMEA		35,970		35,350		33,810
	Asia/Pacific		56,056		48,342		45,866
	South America		3,881		3,927		1,386
Total operating earnings, excluding indirect operating expenses			184,183		165,313		158,895
Non-operating charges			(72,223)		(65,142)		(65,316)
Restructuring and related activities			—		—		439
Combination-related expenses			(16,661)		(29,938)		(1,531)
Depreciation of corporate assets and amortization			(7,518)		(7,489)		(7,134)
Operating income			87,781		62,744		85,353
Other expense, net			(642)		(718)		(492)
Interest expense			(6,158)		(3,892)		(2,889)
Interest income			2,117		2,534		2,037
Income before taxes and equity in net income of
	associated companies	$	83,098	$	60,668	$	84,009

The following tables present information regarding the Company’s reportable operating segments’ assets and long-lived assets as of December 31, 2018, 2017 and 2016:

		2018		2017		2016
Segment assets
	North America (including Corporate)	$	317,934	$	324,260	$	321,404
	EMEA		157,111		177,267		147,021
	Asia/Pacific		212,545		196,891		200,218
	South America		22,075		23,708		23,385
	Total segment assets	$	709,665	$	722,126	$	692,028

		2018		2017		2016
Segment long-lived assets
	North America (including Corporate)	$	84,876	$	88,818	$	86,775
	EMEA		26,239		28,507		25,630
	Asia/Pacific		23,650		22,427		22,040
	South America		2,529		2,691		2,858
	Total segment long-lived assets	$	137,294	$	142,443	$	137,303

The following tables present information regarding the Company’s reportable operating segments’ capital expenditures and depreciation for the years ended December 31, 2018, 2017 and 2016:

		2018		2017		2016
Capital expenditures
	North America (including Corporate)	$	4,574	$	3,919	$	2,918
	EMEA		2,081		3,936		3,263
	Asia/Pacific		6,059		2,458		3,269
	South America		172		559		504
	Total segment capital expenditures	$	12,886	$	10,872	$	9,954

		2018		2017		2016
Depreciation
	North America	$	5,770	$	5,791	$	5,672
	EMEA		3,434		3,368		3,323
	Asia/Pacific		2,552		2,669		2,765
	South America		440		649		672
	Total segment depreciation	$	12,196	$	12,477	$	12,432

During the years ended December 31, 2018, 2017 and 2016, the North America segment had approximately $50.8 million, $49.2 million and $35.8 million of net sales, respectively, which were attributable to non-U.S. operations. As of December 31, 2018, 2017 and 2016, the North America segment had approximately $4.5 million, $4.9 million and $4.9 million of long-lived assets, respectively, which were attributable to non-U.S. operations.

Inter-segment revenue for the years ended December 31, 2018, 2017 and 2016 was $9.7 million, $9.4 million and $8.3 million for North America, $22.0 million, $22.0 million and $18.1 million for EMEA, $0.5 million, $0.4 million and $0.7 million for Asia/Pacific and less than $0.1 million for the years ended December 31, 2018, 2017 and 2016 for South America, respectively. However, all inter-segment transactions have been eliminated from each reportable operating segment’s net sales and earnings for all periods presented in the above tables.

Restructuring and Related Activities

12 Months Ended

Dec. 31, 2018

Restructuring And Related Activities [Abstract]

Restructuring And Related Activities Disclosure [Text Block]

Note 6 – Restructuring and Related Activities

In response to weak economic conditions and market declines in many regions, Quaker’s management approved a global restructuring plan (the “2015 Program”) in the fourth quarter of 2015 to reduce its operating costs. The 2015 Program included provisions for the reduction of total headcount by approximately 65 employees globally. The Company substantially completed all of the initiatives under the 2015 Program in 2016 and settlement of these charges occurred primarily in 2016 as well. During the fourth quarter of 2016, the Company recognized a restructuring credit of $0.4 million in connection with the 2015 Program, due to customary and routine adjustments to initial estimates for employee separation costs. The Company completed all of the remaining initiatives under the 2015 Program during the first half of 2017 and does not expect to incur further restructuring charges under this program.

There were no accrued restructuring liabilities as of December 31, 2017 and no associated cash payments or other restructuring activity during the year ended December 31, 2018. Restructuring activity recognized in each reportable operating segment in connection with the 2015 Program during the years ended December 31, 2017 and 2016 is as follows:

		North						South
		America		EMEA		Asia/Pacific		America		Total
Accrued restructuring as of
December 31, 2015		$	1,867	$	4,265	$	135	$	36	$	6,303
	Restructuring credits		—		(439)		—		—		(439)
	Cash payments		(1,671)		(3,404)		(138)		(39)		(5,252)
	Currency translation adjustments		—		52		3		3		58
Accrued restructuring as of
December 31, 2016			196		474		—		—		670
	Restructuring charges and adjustments		(126)		126		—		—		—
	Cash payments		(70)		(605)		—		—		(675)
	Currency translation adjustments		—		5		—		—		5
Accrued restructuring as of
December 31, 2017		$	—	$	—	$	—	$	—	$	—

Share-Based Compensation

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Disclosure of Compensation Related Costs, Share-based Payments [Text Block]

Note 7 – Share-Based Compensation

The Company recognized the following share-based compensation expense in SG&A in its Consolidated Statements of Income for the years ended December 31, 2018, 2017 and 2016:

		2018		2017		2016
Stock options	$	1,053	$	958	$	848
Nonvested restricted stock awards and restricted stock units		2,459		2,935		3,121
Employee stock purchase plan		89		88		87
Non-elective and elective 401(k) matching contribution in stock		—		72		2,124
Director stock ownership plan		123		137		169
Total share-based compensation expense	$	3,724	$	4,190	$	6,349

During the first quarter of 2017, the Company began matching non-elective and elective 401(k) contributions in cash rather than stock. Also, the Company’s estimated tax payable as of December 31, 2016, was sufficient to fully recognize $0.7 million of excess tax benefits related to stock option exercises as cash inflows from financing activities in its Consolidated Statements of Cash Flows.

Stock option activity under all plans is as follows:

			Weighted		Weighted
			Average		Average
			Exercise		Remaining	Aggregate
		Number of	Price		Contractual	Intrinsic
		Options	(per option)		Term (years)	Value
Options outstanding as of January 1, 2018		111,255	$	97.71
	Options granted	35,842		151.75
	Options exercised	(25,025)		83.96
Options outstanding as of December 31, 2018		122,072	$	116.39	5.0	$	7,185
Options expected to vest after December 31, 2018		86,635	$	125.48	5.3	$	4,312
Options exercisable as of December 31, 2018		35,437	$	94.17	4.2	$	2,873

The total intrinsic value of options exercised during the years ended December 31, 2018, 2017 and 2016 was approximately $2.0 million, $3.4 million and $2.9 million, respectively. Intrinsic value is calculated as the difference between the current market price of the underlying security and the strike price of a related option.

A summary of the Company’s outstanding stock options as of December 31, 2018 is as follows:

						Weighted
						Average	Weighted			Weighted
					Number	Remaining	Average		Number	Average
Range of					of Options	Contractual	Exercise Price		of Options	Exercise Price
Exercise Prices					Outstanding	Term (years)	(per option)		Exercisable	(per option)
$	50.01	-	$	60.00	874	1.2		58.26	874		58.26
$	60.01	-	$	70.00	—	—		—	—		—
$	70.01	-	$	80.00	42,272	4.1		72.19	19,791		72.26
$	80.01	-	$	90.00	2,797	3.2		87.30	2,797		87.30
$	90.01	-	$	130.00	—	—		—	—		—
$	130.01	-	$	140.00	40,287	5.2		134.60	11,975		134.60
$	140.01	-	$	150.00	—	—		—	—		—
$	150.01	-	$	160.00	35,842	6.2		151.75	—		—
					122,072	5.0		116.39	35,437		94.17

As of December 31, 2018, unrecognized compensation expense related to options granted in 2018, 2017 and 2016 was $0.8 million, $0.4 million and less than $0.1 million, respectively, to be recognized over a weighted average period of 1.8 years.

The Company granted stock options under its LTIP plan that are subject only to time vesting over a three-year period in the first quarters of 2018, 2017, 2016 and 2015. For the purposes of determining the fair value of stock option awards, the Company uses the Black-Scholes option pricing model and the assumptions set forth in the table below:

	2018		2017		2016		2015
Number of stock options granted	35,842		42,477		67,444		38,698
Dividend yield	1.37	%	1.49	%	1.49	%	1.55	%
Expected volatility	24.73	%	25.52	%	28.39	%	36.32	%
Risk-free interest rate	2.54	%	1.67	%	1.08	%	1.22	%
Expected term (years)	4.0		4.0		4.0		4.0

These awards are being amortized on a straight-line basis over the respective vesting period of each award. The compensation expense recorded on each award during the years ended December 31, 2018, 2017 and 2016, respectively, is as follows:

		2018		2017		2016
2018 Stock option awards	$	310	$	—	$	—
2017 Stock option awards	$	367	$	308	$	—
2016 Stock option awards	$	332	$	332	$	282
2015 Stock option awards	$	44	$	276	$	276

Activity of nonvested restricted stock awards granted under the Company’s LTIP plan is shown below:

		Weighted
		Average Grant
	Number of	Date Fair Value
	Shares	(per share)
Nonvested awards, December 31, 2017	72,164	$	91.03
Granted	16,166	$	152.38
Vested	(34,954)	$	87.08
Forfeited	(591)	$	121.43
Nonvested awards, December 31, 2018	52,785	$	112.09

The fair value of the nonvested stock is based on the trading price of the Company’s common stock on the date of grant. The Company adjusts the grant date fair value for expected forfeitures based on historical experience for similar awards. As of December 31, 2018, unrecognized compensation expense related to these awards was $2.1 million, to be recognized over a weighted average remaining period of 1.7 years.

Activity of nonvested restricted stock units granted under the Company’s LTIP plan is shown below:

		Weighted
		Average Grant
	Number of	Date Fair Value
	Units	(per unit)
Nonvested awards, December 31, 2017	4,277	$	95.53
Granted	1,549	$	153.84
Vested	(1,176)	$	87.30
Nonvested awards, December 31, 2018	4,650	$	117.03

The fair value of the nonvested restricted stock units is based on the trading price of the Company’s common stock on the date of grant. The Company adjusts the grant date fair value for expected forfeitures based on historical experience for similar awards. As of December 31, 2018, unrecognized compensation expense related to these awards was $0.2 million, to be recognized over a weighted average remaining period of 1.8 years.

Employee Stock Purchase Plan

In 2000, the Board adopted an Employee Stock Purchase Plan (“ESPP”) whereby employees may purchase Company stock through a payroll deduction plan. Purchases are made from the plan and credited to each participant’s account at the end of each month (the “Investment Date”). The purchase price of the stock is 85% of the fair market value on the Investment Date. The plan is compensatory, and the 15% discount is expensed on the Investment Date. All employees, including officers, are eligible to participate in this plan. A participant may withdraw all uninvested payment balances credited to a participant’s account at any time. An employee whose stock ownership of the Company exceeds five percent of the outstanding common stock is not eligible to participate in this plan.

2013 Director Stock Ownership Plan

In 2013, the Company adopted the 2013 Director Stock Ownership Plan (the “Plan”), to encourage the Directors to increase their investment in the Company, which was approved at the Company’s May 2013 shareholders’ meeting. The Plan authorizes the issuance of up to 75,000 shares of Quaker common stock in accordance with the terms of the Plan in payment of all or a portion of the annual cash retainer payable to each of the Company’s non-employee directors in 2013 and subsequent years during the term of the Plan. Under the Plan, each director who, on May 1of the applicable calendar year, owns less than 400% of the annual cash retainer for the applicable calendar year, divided by the average of the closing price of a share of Quaker Common Stock as reported by the composite tape of the New York Stock Exchange for the previous calendar year (the “Threshold Amount”), is required to receive 75% of the annual cash retainer in Quaker common stock and 25% of the retainer in cash, unless the director elects to receive a greater percentage of Quaker common stock, up to 100% of the annual cash retainer for the applicable year. Each director who owns more than the Threshold Amount may elect to receive common stock in payment of a percentage (up to 100%) of the annual cash retainer. The annual retainer is $0.1 million and the retainer payment date is June 1.

Other Income (Expense)

12 Months Ended

Dec. 31, 2018

Other Income and Expenses [Abstract]

Other Income and Other Expense Disclosure [Text Block]

Note 8 – Other Expense, net

Other expense, net, for the years ended December 31, 2018, 2017 and 2016 are as follows:

	2018		2017		2016
Income from third party license fees	$	862	$	861	$	978
Foreign exchange (losses) gains, net		(807)		891		172
Gain (loss) on fixed asset disposals, net		657		(79)		50
Non-income tax refunds and other related credits		668		1,015		398
Pension and postretirement benefit costs, non-service components		(2,285)		(4,234)		(2,302)
Insurance insolvency recovery		90		600		—
Other non-operating income		425		380		338
Other non-operating expense		(252)		(152)		(126)
Total other expense, net	$	(642)	$	(718)	$	(492)

Foreign exchange (losses) gains, net, during the year ended December 31, 2018 include both a foreign currency transaction loss of approximately $0.4 million related to hyper-inflationary accounting for the Company’s Argentina subsidiary effective July 1, 2018 and a foreign currency transaction gain of approximately $0.4 million related to the liquidation of an inactive legal entity. In addition, gain (loss) on fixed asset disposals, net, during the year ended December 31, 2018 and 2017 includes a $0.6 million gain and a $0.1 million loss, respectively, on the sale of held-for-sale assets in each period. Pension and postretirement benefit costs, non-service components during the year ended December 31, 2017 includes a $1.9 million pension settlement charge. See Note 20 of Notes to Consolidated Financial Statements. Insurance insolvency recovery during the years ended December 31, 2018 and 2017 represents cash proceeds from an insolvent insurance carrier with respect to a previously filed recovery claim by an inactive subsidiary of the Company.

Taxes on Income

12 Months Ended

Dec. 31, 2018

Taxes on Income and Uncertain Tax Positions [Abstract]

Taxes on Income [Text Block]

Note 9 – Taxes on Income

On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as U.S. Tax Reform. U.S. Tax Reform included multiple changes to the U.S. tax code with varying effects on the Company’s 2017 results, including, but not limited to, (i) a revaluation of the Company’s U.S. deferred tax assets and liabilities based upon the reduction of the U.S. federal statutory corporate income tax rate from 35% to 21% and (ii) implementation of a new system of taxation for non-U.S. earnings which eliminates U.S. federal income taxes on dividends from certain foreign subsidiaries and imposes a one-time transition tax on the deemed repatriation of undistributed earnings of certain foreign subsidiaries that is payable over eight years. U.S. Tax Reform also made changes to the U.S. tax code that have impacted 2018 and will impact future years, including, but not limited to, (i) reduction of the U.S. federal statutory corporate tax rate; (ii) elimination of the corporate alternative minimum tax; (iii) the creation of the base erosion anti-abuse tax, a new minimum tax; (iv) a general elimination of U.S. federal income taxes on dividends from foreign subsidiaries; (v) a new provision designed to tax global intangible low-taxed income (“GILTI”), which allows for the possibility of using foreign tax credits and a deduction of up to 50 percent to offset the income tax liability (subject to some limitations); (vi) a new limitation on deductible interest expense; (vii) the repeal of the U.S. production activity deduction; (viii) limitations on the deductibility of certain executive compensation; (ix) limitations on the use of foreign tax credits to reduce the U.S. income tax liability; (x) a reduction in the dividends received deduction from 70% to 50% (in the case of less-than-20%-owned subsidiaries) and from 80% to 65% (in the case of less-than-80%-owned subsidiaries); and (xi) limitations on net operating losses generated after December 31, 2017 to 80 percent of taxable income.

Also, in 2017, the Securities and Exchange Commission issued guidance on accounting for the tax effects of U.S. Tax Reform and provided a one-year measurement period for companies to complete the accounting. The Company’s initial analysis of the impact of U.S. Tax Reform resulted in an incremental tax expense of $22.2 million recorded during the fourth quarter of 2017. U.S. Tax Reform reduced the U.S. federal statutory corporate tax rate from 35% to 21% effective January 1, 2018. Consequently, the Company recorded a decrease in U.S. net deferred tax assets of approximately $4.5 million with a corresponding net adjustment to deferred income tax expense during the fourth quarter of 2017. This initial estimate was not adjusted during 2018. The Transition Tax is a tax on previously untaxed accumulated and current earnings and profits of certain of the Company’s foreign subsidiaries as of either the November 2, 2017 or December 31, 2017 measurement date provided within U.S. Tax Reform. The Company made a reasonable estimate of its Transition Tax and recorded a gross provisional Transition Tax obligation during the fourth quarter of 2017 of $18.4 million, or $17.8 million, net of the impact of eliminating U.S. Federal income taxes on dividends from certain foreign subsidiaries received during 2017.

Subsequent to numerous temporary regulations, notices, and other formal guidance published by the Internal Revenue Service (“IRS”), U.S. Treasury, and various state taxing authorities in 2018, the Company completed its accounting for the tax effects of U.S. Tax Reform as of December 22, 2018 and refined the total incremental tax expense related to U.S. Tax Reform to approximately $28.0 million. Based on proposed regulations published by the U.S. federal and state taxing authorities, the Company recorded a $2.5 million tax benefit to adjust its net Transition Tax to $15.3 million. The Company elected to pay its Transition Tax in installments over eight years as provided for in U.S. Tax Reform. In addition, the Company recorded deferred income tax expense of $0.3 million in 2018 related to the deductibility of certain executive compensation based on formal guidance issued by the IRS in 2018. As a result of the impacts from U.S. Tax Reform, the Company re-evaluated its global cash strategy resulting in a change to its indefinite reinvestment assertion attributable to a portion of its undistributed foreign earnings and recognized a deferred tax liability and corresponding deferred tax expense of $7.9 million, which primarily represents the Company’s estimate of the non-U.S. income taxes the Company will incur to ultimately remit those earnings to the U.S. The Company’s reinvestment assertions are further explained below.

Taxes on income before equity in net income of associated companies for the years ended December 31, 2018, 2017 and 2016 are as follows:

			2018		2017		2016
Current:
	Federal	$	6,583	$	21,265	$	4,680
	State		(1,844)		2,529		518
	Foreign		12,114		14,105		12,540
			16,853		37,899		17,738
Deferred:
	Federal		7,859		6,889		4,601
	State		(173)		(36)		104
	Foreign		511		(3,099)		783
Total		$	25,050	$	41,653	$	23,226

The components of earnings before income taxes for the years ended December 31, 2018, 2017 and 2016 are as follows:

		2018		2017		2016
U.S.	$	27,387	$	10,468	$	31,175
Foreign		55,711		50,200		52,834
Total	$	83,098	$	60,668	$	84,009

Total deferred tax assets and liabilities are composed of the following as of December 31, 2018 and 2017:

		2018		2017
Retirement benefits	$	3,532	$	5,472
Allowance for doubtful accounts		1,160		1,134
Insurance and litigation reserves		396		497
Postretirement benefits		896		1,056
Supplemental retirement benefits		2,862		2,679
Performance incentives		4,347		3,779
Equity-based compensation		753		1,071
Insurance settlement		4,374		4,581
Operating loss carryforward		8,434		8,602
Foreign tax credit and other credits		1,929		3,043
Uncertain tax positions		(400)		(410)
Other		2,645		2,816
		30,928		34,320
Valuation allowance		(7,520)		(7,401)
Total deferred tax assets, net	$	23,408	$	26,919
Depreciation		4,049		4,444
Foreign pension and other		1,062		1,295
Amortization and other		13,497		15,373
Unremitted Earnings		7,857		—
Total deferred tax liabilities	$	26,465	$	21,112

The following are the changes in the Company’s deferred tax asset valuation allowance for the years ended December 31, 2018, 2017 and 2016:

								Effect of
		Balance at		Additional		Allowance		Exchange		Balance
		Beginning		Valuation		Utilization		Rate		at End
		of Period		Allowance		and Other		Changes		of Period
Valuation Allowance
Year ended December 31, 2018	$	7,401	$	650	$	(471)	$	(60)	$	7,520
Year ended December 31, 2017	$	6,344	$	1,127	$	(61)	$	(9)	$	7,401
Year ended December 31, 2016	$	6,259	$	294	$	(187)	$	(22)	$	6,344

The Company’s net deferred tax assets and liabilities are classified in the Consolidated Balance Sheets as of December 31, 2018 and 2017 as follows:

	2018		2017
Non-current deferred tax assets	$	6,946	$	15,460
Non-current deferred tax liabilities		10,003		9,653
Net deferred tax (liability) asset	$	(3,057)	$	5,807

The following is a reconciliation of income taxes at the Federal statutory rate with income taxes recorded by the Company for the years ended December 31, 2018, 2017 and 2016:

		2018		2017		2016
Income tax provision at the Federal statutory tax rate	$	17,458	$	21,229	$	29,403
Unremitted Earnings		7,857		—		—
Transition Tax		(3,118)		18,388		—
Revaluation of U.S. deferred tax assets and liabilities		—		4,470		—
Global intangible low taxed income		1,211		—		—
Foreign derived intangible income		(1,034)		—		—
Non-deductible acquisition expenses		1,019		4,779		696
Share-based compensation		259		(1,419)		—
Differences in tax rates on foreign earnings and remittances		1,081		(2,663)		(2,862)
Foreign dividends		—		—		2,939
Excess foreign tax credit utilization		—		(2,761)		(5,493)
Research and development activities credit utilization		(230)		(235)		(238)
Uncertain tax positions		(79)		(651)		(833)
U.S. domestic production activities deduction		—		(1,155)		(875)
State income tax provisions, net		196		569		357
Non-deductible entertainment and business meals expense		415		248		238
Miscellaneous items, net		15		854		(106)
Taxes on income before equity in net income of associated companies	$	25,050	$	41,653	$	23,226

As of December 31, 2018, the Company had a net deferred tax liability of $2.0 million in the U.S. In addition, the Company has foreign tax loss carryforwards of $6.6 million of which none will expire through 2023, and $0.6 million expires thereafter. The remaining foreign tax losses have no expiration dates. A partial valuation allowance has been established with respect to the tax benefit of these losses for $0.4 million.

Pursuant to U.S. Tax Reform, specifically the Transition Tax, the Company has recorded a charge for U.S. income taxes on its undistributed earnings of non-U.S. subsidiaries; however, the Company could be subject to other taxes, such as withholding taxes and dividend distribution taxes if these undistributed earnings are ultimately remitted to the U.S. As a result of the impacts from U.S. Tax reform, the Company re-evaluated its global cash strategy, resulting in a change to its indefinite reinvestment assertion attributable to a portion of its undistributed foreign earnings, and recognized a deferred tax liability and corresponding deferred tax expense of $7.9 million as of December 31, 2018, which primarily represents the Company’s estimate of the non-U.S. taxes the Company will incur to ultimately remit these earnings to the U.S. It is the Company’s current intention to reinvest its additional undistributed earnings of non-U.S. subsidiaries to support working capital needs and certain other growth initiatives. The amount of such undistributed earnings at December 31, 2018 was approximately $210.0 million. Any tax liability which might result from ultimate remittance of these earnings is expected to be substantially offset by foreign tax credits (subject to certain limitations). It is currently impractical to estimate any such incremental tax expense.

As of December 31, 2018, the Company’s cumulative liability for gross unrecognized tax benefits was $7.1 million. The Company had accrued approximately $0.8 million for cumulative penalties and $0.6 million for cumulative interest as of December 31, 2018. As of December 31, 2017, the Company’s cumulative liability for gross unrecognized tax benefits was $6.8 million. The Company had accrued approximately $1.0 million for cumulative penalties and $0.6 million for cumulative interest as of December 31, 2017.

The Company continues to recognize interest and penalties associated with uncertain tax positions as a component of tax expense on income before equity in net income of associated companies in its Consolidated Statements of Income. The Company recognized a credit of $0.2 million for penalties and an expense of $0.1 million for interest (net of expirations and settlements) in its Consolidated Statement of Income for the year ended December 31, 2018, a credit of $0.7 million for penalties and a credit of $0.2 million for interest (net of expirations and settlements) in its Consolidated Statement of Income for the year ended December 31, 2017, and a credit of $0.2 million for penalties and a credit of $0.7 million for interest (net of expirations and settlements) in its Consolidated Statement of Income for the year ended December 31, 2016.

The Company estimates that during the year ending December 31, 2019, it will reduce its cumulative liability for gross unrecognized tax benefits by approximately $0.9 million due to the expiration of the statute of limitations with regard to certain tax positions. This estimated reduction in the cumulative liability for unrecognized tax benefits does not consider any increase in liability for unrecognized tax benefits with regard to existing tax positions or any increase in cumulative liability for unrecognized tax benefits with regard to new tax positions for the year ending December 31, 2019. A reconciliation of the beginning and ending amounts of unrecognized tax benefits for the years ended December 31, 2018, 2017 and 2016, respectively, is as follows:

			2018		2017		2016
Unrecognized tax benefits as of January 1		$	6,761	$	6,240	$	11,032
	Decrease in unrecognized tax benefits taken in prior periods		(183)		(308)		(869)
	Increase in unrecognized tax benefits taken in current period		2,023		2,347		1,921
	Decrease in unrecognized tax benefits due to lapse of statute of limitations		(1,292)		(2,116)		(5,744)
	(Decrease) increase due to foreign exchange rates		(259)		598		(100)
Unrecognized tax benefits as of December 31		$	7,050	$	6,761	$	6,240

The amount of unrecognized tax benefits above that, if recognized, would impact the Company’s tax expense and effective tax rate is $2.2 million, $2.2 million and $1.8 million for the years ended December 31, 2018, 2017 and 2016, respectively.

The Company and its subsidiaries are subject to U.S. Federal income tax, as well as the income tax of various state and foreign tax jurisdictions. Tax years that remain subject to examination by major tax jurisdictions include Brazil from 2000, Italy from 2007, the Netherlands from 2012, the United Kingdom and Mexico from 2013, Spain and China from 2014, India from fiscal year beginning April 1, 2016 and ending March 31, 2017, the U.S. from 2015, and various U.S. state tax jurisdictions from 2009.

As previously reported, the Italian tax authorities have assessed additional tax due from the Company’s subsidiary, Quaker Italia S.r.l., relating to the tax years 2007 through 2013. The Company has filed for competent authority relief from these assessments under the Mutual Agreement Procedures (“MAP”) of the Organization for Economic Co-Operation and Development for all years except 2007. During the second quarter of 2018, the Italian tax authorities assessed additional tax due from Quaker Italia, S.r.l., relating to the tax years 2014 and 2015. The Company met with the Italian tax authorities in the fourth quarter of 2018 to discuss these assessments and no resolution was agreed upon, so the Company filed an appeal with the first level of tax court in Italy. If the appeal is not successful in materially reducing the assessed tax, then the Company will further evaluate its options including potentially filing for competent authority relief from these assessments under MAP, consistent with the Company’s previous filings for 2008 through 2013. As of December 31, 2018, the Company believes it has adequate reserves for uncertain tax positions with respect to these and all other audits.

Earnings Per Share

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Earnings Per Share [Text Block]

Note 10 – Earnings Per Share

The following table summarizes earnings per share calculations for the years ended December 31, 2018, 2017 and 2016:

		2018		2017		2016
Basic earnings per common share
	Net income attributable to Quaker Chemical Corporation	$	59,473	$	20,278	$	61,403
	Less: income allocated to participating securities		(253)		(137)		(515)
	Net income available to common shareholders	$	59,220	$	20,141	$	60,888
	Basic weighted average common shares outstanding		13,268,047		13,204,872		13,136,138
Basic earnings per common share		$	4.46	$	1.53	$	4.64

Diluted earnings per common share
	Net income attributable to Quaker Chemical Corporation	$	59,473	$	20,278	$	61,403
	Less: income allocated to participating securities		(252)		(137)		(514)
	Net income available to common shareholders	$	59,221	$	20,141	$	60,889
	Basic weighted average common shares outstanding		13,268,047		13,204,872		13,136,138
	Effect of dilutive securities		36,685		41,074		24,331
	Diluted weighted average common shares outstanding		13,304,732		13,245,946		13,160,469
Diluted earnings per common share		$	4.45	$	1.52	$	4.63

Certain stock options and restricted stock units are not included in the diluted earnings per share calculation since the effect would have been anti-dilutive. The calculated amount of anti-diluted shares not included were 1,808 in 2018, 3,671 in 2017 and 678 in 2016.

Restricted Cash

12 Months Ended

Dec. 31, 2018

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract]

Cash And Cash Equivalents Disclosure [Text Block]

Note 11 – Restricted Cash

The Company has restricted cash recorded in Other assets related to proceeds from an inactive subsidiary of the Company which previously executed separate settlement and release agreements with two of its insurance carriers for an original total value of $35.0 million. The proceeds of both settlements are restricted and can only be used to pay claims and costs of defense associated with the subsidiary’s asbestos litigation. The proceeds of the settlement and release agreements have been deposited into interest bearing accounts which earned $0.2 million and less than $0.1 million in the years ended December 31, 2018 and 2017, respectively, offset by $1.1 million and $0.8 million of net payments in 2018 and 2017, respectively. Due to the restricted nature of the proceeds, a corresponding deferred credit was established in Other non-current liabilities for an equal and offsetting amount, and will remain until the restrictions lapse or the funds are exhausted via payments of claims and costs of defense. See also Notes 17, 21 and 25 of Notes to Consolidated Financial Statements.

The following table provides a reconciliation of cash, cash equivalents and restricted cash as December 31, 2018, 2017, 2016 and 2015:

	2018		2017		2016		2015
Cash and cash equivalents	$	104,147	$	89,879	$	88,818	$	81,053
Restricted cash included in other assets		20,278		21,171		21,883		22,874
Cash, cash equivalents and restricted cash	$	124,425	$	111,050	$	110,701	$	103,927

Accounts Receivable and Allowance for Doubtful Accounts

12 Months Ended

Dec. 31, 2018

Accounts Receivable and Allowance for Doubtful Accounts [Abstract]

Accounts Receivable and Allowance for Doubtful Accounts [Text Block]

Note 12 – Accounts Receivable and Allowance for Doubtful Accounts

As of December 31, 2018 and 2017, the Company had gross trade accounts receivable totaling $207.3 million and $213.8 million with trade accounts receivable greater than 90 days past due of $13.2 million and $15.2 million, respectively. The following are changes in the allowance for doubtful accounts during the years ended December 31, 2018, 2017 and 2016:

							Exchange Rate
	Balance at		Changes		Write-Offs		Changes		Balance
	Beginning		to Costs and		Charged to		and Other		at End
	of Period		Expenses		Allowance		Adjustments		of Period
Allowance for Doubtful Accounts
Year ended December 31, 2018	$	5,457	$	493	$	(295)	$	(468)	$	5,187
Year ended December 31, 2017	$	7,220	$	137	$	(2,206)	$	306	$	5,457
Year ended December 31, 2016	$	7,818	$	1,375	$	(1,949)	$	(24)	$	7,220

Included in exchange rate changes and other adjustments for the year ended December 31, 2018 is a reclassification of $0.3 million to Other assets related to certain customer receivables due greater than a year. There were no similar adjustments in 2017 or 2016. Included in write-offs charged to allowance during the years ended December 31, 2017 and 2016 were outstanding receivables related to certain prior year customer bankruptcies, which the Company previously reserved for, but settled during 2017 and 2016, respectively. Included in December 31, 2016 is an allowance for doubtful accounts of less than $0.1 million acquired in 2017 business acquisitions. There were no similar adjustments in 2018 or 2017.

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References + Details

Inventories

12 Months Ended

Dec. 31, 2018

Inventories [Abstract]

Inventories [Text Block]

Note 13 – Inventories

Inventories, net, as of December 31, 2018 and 2017 were as follows:

		2018		2017
Raw materials and supplies	$	48,134	$	44,439
Work in process, finished goods and reserves		45,956		42,782
Total inventories, net	$	94,090	$	87,221

Property, Plant and Equipment

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment [Text Block]

Note 14 – Property, Plant and Equipment

Property, plant and equipment as of December 31, 2018 and 2017 were as follows:

		2018		2017
Land	$	10,170	$	10,635
Building and improvements		84,980		87,111
Machinery and equipment		151,180		153,312
Construction in progress		7,907		4,932
Property, Plant and Equipment, at cost		254,237		255,990
Less accumulated depreciation		(170,314)		(169,286)
Total Property, Plant and Equipment, net	$	83,923	$	86,704

As of December 31, 2018, property, plant and equipment include less than $0.1 million of a capital lease asset and future minimum lease payments in the Company’s Asia/Pacific segment.

Goodwill and Intangible Assets

12 Months Ended

Dec. 31, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill And Intangible Assets Disclosure [Text Block]

Note 15 – Goodwill and Other Intangible Assets

The Company completes its annual goodwill impairment test during the fourth quarter of each year, or more frequently if triggering events indicate a possible impairment in one or more of its reporting units. The Company continually evaluates financial performance, economic conditions and other relevant developments in assessing if an interim period impairment test for one or more of its reporting units is necessary. The Company completed its annual impairment assessment during the fourth quarter of 2018 and no impairment charge was warranted. In addition, the Company has recorded no impairment charges in its past.

Changes in the carrying amount of goodwill for the years ended December 31, 2018 and 2017 were as follows:

		North						South
		America		EMEA		Asia/Pacific		America		Total
Balance as of December 31, 2016		$	45,490	$	18,189	$	14,566	$	2,559	$	80,804
	Goodwill additions		1,832		—		—		—		1,832
	Currency translation adjustments		249		2,315		890		(56)		3,398
Balance as of December 31, 2017			47,571		20,504		15,456		2,503		86,034
	Currency translation adjustments		(268)		(1,169)		(869)		(395)		(2,701)
Balance as of December 31, 2018		$	47,303	$	19,335	$	14,587	$	2,108	$	83,333

Gross carrying amounts and accumulated amortization for definite-lived intangible assets as of December 31, 2018 and 2017 were as follows:

	Gross Carrying				Accumulated
	Amount				Amortization
	2018		2017		2018		2017
Customer lists and rights to sell	$	74,989	$	76,581	$	29,587	$	25,394
Trademarks, formulations and product technology		33,275		33,025		16,469		14,309
Other		5,840		6,114		5,566		5,514
Total definite-lived intangible assets	$	114,104	$	115,720	$	51,622	$	45,217

The Company recorded $7.3 million, $7.4 million and $7.0 million of amortization expense during the years ended December 31, 2018, 2017 and 2016, respectively. Estimated annual aggregate amortization expense for the subsequent five years is as follows:

For the year ended December 31, 2019	$	7,160
For the year ended December 31, 2020		6,879
For the year ended December 31, 2021		6,529
For the year ended December 31, 2022		6,374
For the year ended December 31, 2023		6,155

The Company has two indefinite-lived intangible assets totaling $1.1 million for trademarks as of December 31, 2018 and 2017.

Investments in Associated Companies

12 Months Ended

Dec. 31, 2018

Investments in Associated Companies [Abstract]

Investments in Associated Companies [Text Block]

Note 16 – Investments in Associated Companies

As of December 31, 2018, the Company held a 50% investment in and had significant influence over Nippon Quaker Chemical, Ltd. (Japan) and Kelko Quaker Chemical, S.A. (Panama) and held a 33% investment in and had significant influence over Primex, Ltd. (Barbados). The carrying amount of the Company’s equity investments as of December 31, 2018 was $21.3 million, which includes its investments of $14.7 million in Primex, Ltd. (Barbados); $6.2 million in Nippon Quaker Chemical, Ltd. (Japan); and $0.4 million in Kelko Quaker Chemical, S.A. (Panama).

The Company has a 50-50 joint venture in a Venezuelan affiliate, Kelko Venezuela. Due to heightened foreign exchange controls, current economic circumstances and other restrictions in Venezuela, during the third quarter of 2018 the Company concluded that it no longer had significant influence over this affiliate. Prior to this determination, the Company historically accounted for this affiliate under the equity method. As of December 31, 2018, the Company has no remaining carrying value for its investment in Kelko Venezuela.

Summarized financial information of Nippon Quaker Chemical, Ltd. (Japan) and Kelko Quaker Chemical, S.A. (Panama) for 2018 and Nippon Quaker Chemical, Ltd. (Japan), Kelko Quaker Chemical, S.A. (Panama) and Kelko Quaker Chemical, S.A. (Venezuela) for 2017 and 2016, in the aggregate, is as follows:

		As of December 31,
		2018		2017
Current assets	$	43,581	$	37,683
Noncurrent assets		990		936
Current liabilities		29,632		24,858
Noncurrent liabilities		1,685		1,457

		Year Ended December 31,
		2018		2017		2016
Net sales	$	43,875	$	42,555	$	41,448
Gross margin		12,983		13,440		13,082
Income before income taxes		2,494		2,900		2,289
Net income		1,874		1,471		1,210

Summarized financial information of Primex, Ltd. is as follows:

		As of December 31,
		2018		2017
Total assets	$	103,705	$	120,154
Total liabilities		53,049		54,258

		Year Ended December 31,
		2018		2017		2016
Revenue	$	5,841	$	14,042	$	5,632
Income before income taxes		3,688		11,705		5,622
Net income		2,954		7,788		5,148

Other Assets

12 Months Ended

Dec. 31, 2018

Other Assets [Abstract]

Other Assets [Text Block]

Note 17 – Other Assets

Other assets as of December 31, 2018 and 2017 were as follows:

	2018		2017
Restricted insurance settlement	$	20,278	$	21,171
Uncertain tax positions		4,861		4,543
Supplemental retirement income program		1,491		1,594
Pension assets		3,656		1,184
Other		1,769		1,557
Total other assets	$	32,055	$	30,049

As of December 31, 2018 and 2017, one of the Company’s U.S. pension plan’s fair value of plan assets exceeded its gross benefit obligation and was therefore over-funded, which is represented by the line Pension assets in the table above. See also Note 20 of Notes to Consolidated Financial Statements.

Other Current Liabilities

12 Months Ended

Dec. 31, 2018

Other Current Liabilities [Abstract]

Other Accrued Liabilities Disclosure [Text Block]

Note 18 – Other Current Liabilities

Other current liabilities as of December 31, 2018 and 2017 were as follows:

		2018		2017
Non-income taxes	$	8,462	$	9,196
Accrued interest		4,340		884
Professional fees		3,831		5,019
Selling expenses		3,582		2,846
Freight		2,188		1,780
Customer advances and sales return reserves		2,187		1,507
Current income taxes payable		1,358		841
Legal		1,067		1,169
Accrued rent and facilities		763		775
Other		3,330		3,304
Total other current liabilities	$	31,108	$	27,321

Debt

12 Months Ended

Dec. 31, 2018

Debt [Abstract]

Debt [Text Block]

Note 19 – Debt

Debt as of December 31, 2018 and 2017 includes the following:

		2018		2017
Credit facilities	$	24,034	$	48,514
Industrial development bonds		10,000		15,000
Municipality-related loans		2,549		3,290
Other debt obligations (including capital leases)		21		—
Total debt		36,604		66,804
Current portion of long-term debt		(670)		(5,736)
Long-term debt	$	35,934	$	61,068

Credit facilities

The Company’s primary credit facility (“the Credit Facility”) is a $300.0 million syndicated multicurrency credit agreement with a group of lenders. The maximum amount available under the Credit Facility can be increased to $400.0 million at the Company’s option if the lenders agree and the Company satisfies certain conditions. Borrowings under the Credit Facility generally bear interest at a base rate or LIBOR rate plus a margin. The Credit Facility has certain financial and other covenants, with the key financial covenant requiring that the Company’s consolidated total debt to adjusted EBITDA ratio cannot exceed 3.50 to 1. As of December 31, 2018 and 2017, the Company’s consolidated total debt to adjusted EBITDA ratio was below 1.0 to 1, and the Company was also in compliance with all of its other covenants. During the fourth quarter of 2018, the Credit Facility was amended and restated to extend the maturity date to March 15, 2020. As of December 31, 2018 and 2017, the Company had total credit facility borrowings of $24.0 million and $48.5 million, primarily under the Credit Facility, at weighted average borrowing rates of 1.00% and 1.88%, respectively.

Industrial development bonds

As of December 31, 2018 and 2017, the Company had a fixed rate, industrial development authority bond for $10.0 million due in 2028 and bearing interest at a rate of 5.26%. As of December 31, 2017, the Company also had a $5.0 million industrial development authority bond bearing interest at a rate of 5.60%, which matured and was paid off during the fourth quarter of 2018. These bonds have similar covenants to the Credit Facility, noted above.

Municipality-related loans

As part of a past expansion project at the Company’s Middletown, Ohio facility, it agreed to a low interest rate $3.5 million loan with the Ohio Department of Development. Principal repayment on this loan began in September 2010 with its final maturity being in February 2021. The current interest rate of 2% will rise to 3% beginning March 2019 until final maturity. As of December 31, 2018 and 2017, there was $0.8 million and $1.1 million, respectively, outstanding on this loan.

The Company’s Verkol S.A.U. (“Verkol”) subsidiary has certain loans issued by the local government which are either interest-free or bear interest at a subsidized rate. These loans mature periodically, with the last maturity occurring in 2028. The Company records these loans at fair value based on market interest rates on the date of acquisition and continues to measure the loans at amortized cost, recognizing the implicit interest incurred. As of December 31, 2018 and 2017, there was $1.8 million and $2.2 million, respectively, outstanding for these loans.

During the next five years, payments on the Company’s debt are due as follows:

2019	$	670
2020		24,730
2021		398
2022		270
2023		240

As of December 31, 2018 and 2017, the amounts at which the Company’s debt is recorded are not materially different from their fair market value.

Pension and Postretirement Benefits

12 Months Ended

Dec. 31, 2018

Pension and Other Postretirement Benefits [Abstract]

Pension And Other Postretirement Benefits Disclosure [Text Block]

Note 20 – Pension and Other Postretirement Benefits

The following table shows the Company’s plans’ funded status reconciled with amounts reported in the Consolidated Balance Sheets as of December 31, 2018 and 2017:

																Other Post-
				Pension Benefits												Retirement Benefits
				2018							2017					2018		2017
Change in benefit obligation				Foreign		U.S.		Total		Foreign		U.S.		Total		U.S.		U.S.
Gross benefit obligation at beginning
	of year			$	118,352	$	62,977	$	181,329	$	103,491	$	67,254	$	170,745	$	4,729	$	4,730
Service cost					3,426		383		3,809		3,219		337		3,556		7		8
Interest cost					2,254		1,847		4,101		2,066		1,932		3,998		130		144
Employee contributions					73		—		73		68		—		68		—		—
Plan settlements					(10)		—		(10)		—		(4,341)		(4,341)		—		—
Benefits paid					(1,639)		(4,330)		(5,969)		(2,503)		(4,031)		(6,534)		(317)		(448)
Plan expenses and premiums paid					(161)		—		(161)		(210)		—		(210)		—		—
Actuarial (gain) loss					(5,561)		(2,143)		(7,704)		(1,164)		1,826		662		(443)		295
Translation differences and other					(5,418)		—		(5,418)		13,385		—		13,385		—		—
Gross benefit obligation at end of year				$	111,316	$	58,734	$	170,050	$	118,352	$	62,977	$	181,329	$	4,106	$	4,729
Change in plan assets
Fair value of plan assets at
year	beginning of year			$	98,622	$	51,964	$	150,586	$	86,844	$	49,197	$	136,041	$	—	$	—
Actual return on plan assets					(2,670)		457		(2,213)		116		6,865		6,981		—		—
Employer contributions					5,269		1,574		6,843		2,867		4,574		7,441		317		448
Employee contributions					73		—		73		68		—		68		—		—
Plan settlements					(10)		—		(10)		—		(4,341)		(4,341)		—		—
Benefits paid					(1,639)		(4,330)		(5,969)		(2,503)		(4,031)		(6,534)		(317)		(448)
Plan expenses and premiums paid					(161)		(250)		(411)		(210)		(300)		(510)		—		—
Translation differences					(4,658)		—		(4,658)		11,440		—		11,440		—		—
Fair value of plan assets at end of year				$	94,826	$	49,415	$	144,241	$	98,622	$	51,964	$	150,586	$	—	$	—
Net benefit obligation recognized				$	(16,490)	$	(9,319)	$	(25,809)	$	(19,730)	$	(11,013)	$	(30,743)	$	(4,106)	$	(4,729)
Amounts recognized in the balance
	sheet consist of:
		Non-current assets		$	—	$	3,656	$	3,656	$	—	$	1,184	$	1,184	$	—	$	—
		Current liabilities			(206)		(559)		(765)		(89)		(560)		(649)		(446)		(459)
		Non-current liabilities			(16,284)		(12,416)		(28,700)		(19,641)		(11,637)		(31,278)		(3,660)		(4,270)
Net benefit obligation recognized				$	(16,490)	$	(9,319)	$	(25,809)	$	(19,730)	$	(11,013)	$	(30,743)	$	(4,106)	$	(4,729)
Amounts not yet reflected in net
	periodic benefit costs and included in
	accumulated other comprehensive loss:
		Prior service credit (cost)		$	1,497	$	—	$	1,497	$	1,744	$	(59)	$	1,685	$	—	$	—
		Accumulated loss			(20,089)		(25,310)		(45,399)		(22,598)		(27,133)		(49,731)		(338)		(823)

		AOCI			(18,592)		(25,310)		(43,902)		(20,854)		(27,192)		(48,046)		(338)		(823)
		Cumulative employer contributions
			in excess of or (below) net periodic
			benefit cost		2,102		15,991		18,093		1,124		16,179		17,303		(3,768)		(3,906)
Net benefit obligation recognized				$	(16,490)	$	(9,319)	$	(25,809)	$	(19,730)	$	(11,013)	$	(30,743)	$	(4,106)	$	(4,729)

The accumulated benefit obligation for all defined benefit pension plans was $165.3 million ($57.6 million U.S. and $107.7 million Foreign) and $176.3 million ($62.2 million U.S. and approximately $114.1 million Foreign) as of December 31, 2018 and 2017, respectively.

Information for pension plans with an accumulated benefit obligation in excess of plan assets:

	2018							2017
	Foreign		U.S.		Total		Foreign		U.S.		Total
Projected benefit obligation	$	111,316	$	12,975	$	124,291	$	118,352	$	12,197	$	130,549
Accumulated benefit obligation		107,685		11,808		119,493		114,069		11,456		125,525
Fair value of plan assets		94,826		—		94,826		98,622		—		98,622

Information for pension plans with a projected benefit obligation in excess of plan assets:

	2018							2017
	Foreign		U.S.		Total		Foreign		U.S.		Total
Projected benefit obligation	$	111,316	$	12,975	$	124,291	$	118,352	$	12,197	$	130,549
Fair value of plan assets		94,826		—		94,826		98,622		—		98,622

Components of net periodic benefit costs – pension plans:

	2018							2017
	Foreign		U.S.		Total		Foreign		U.S.		Total
Service cost	$	3,426	$	383	$	3,809	$	3,219	$	337	$	3,556
Interest cost		2,254		1,847		4,101		2,066		1,932		3,998
Expected return on plan assets		(2,228)		(2,803)		(5,031)		(1,994)		(3,067)		(5,061)
Settlement loss		2		—		2		—		1,946		1,946
Actuarial loss amortization		881		2,276		3,157		862		2,396		3,258
Prior service (credit) cost
amortization		(175)		59		(116)		(167)		63		(104)
Net periodic benefit cost	$	4,160	$	1,762	$	5,922	$	3,986	$	3,607	$	7,593

		2016
	Foreign		U.S.		Total
Service cost	$	2,378	$	298	$	2,676
Interest cost		2,314		2,114		4,428
Expected return on plan assets		(2,026)		(3,316)		(5,342)
Actuarial loss amortization		839		2,336		3,175
Prior service (credit) cost amortization		(164)		63		(101)
Net periodic benefit cost	$	3,341	$	1,495	$	4,836

Other changes recognized in other comprehensive income – pension plans:

			2018							2017
			Foreign		U.S.		Total		Foreign		U.S.		Total
Net (gain) loss arising during
	the period		$	(663)	$	453	$	(210)	$	715	$	(1,672)	$	(957)
Recognition of amortization in net
	periodic benefit cost
		Prior service credit (cost)		175		(59)		116		167		(63)		104
		Actuarial loss		(883)		(2,276)		(3,159)		(862)		(4,342)		(5,204)
Effect of exchange rates on amounts
		included in AOCI		(890)		—		(890)		2,308		—		2,308
Total recognized in other
		comprehensive (income) loss		(2,261)		(1,882)		(4,143)		2,328		(6,077)		(3,749)
Total recognized in net periodic
	benefit cost and other
	comprehensive loss (income)		$	1,899	$	(120)	$	1,779	$	6,314	$	(2,470)	$	3,844

			2016
				Foreign		U.S.		Total
Net gain arising during period			$	2,401	$	3,576	$	5,977
Recognition of amortization in net periodic benefit
		Prior service credit (cost)		164		(63)		101
		Actuarial loss		(839)		(2,336)		(3,175)
Effect of exchange rates on amounts included
	in AOCI			(1,347)		—		(1,347)

Total recognized in other comprehensive loss				379		1,177		1,556
Total recognized in net periodic benefit cost and
	other comprehensive loss		$	3,720	$	2,672	$	6,392

Components of net periodic benefit costs – other postretirement plan:

		2018		2017		2016
Service cost	$	7	$	8	$	10
Interest cost		130		144		142
Actuarial loss amortization		42		54		—
Net periodic benefit costs	$	179	$	206	$	152

Other changes recognized in other comprehensive income – other postretirement benefit plans:

			2018		2017		2016
Net (gain) loss arising during period		$	(443)	$	295	$	(401)
Amortization of actuarial loss in net periodic
	benefit costs		(42)		(54)		—
Total recognized in other comprehensive (income)
	loss		(485)		241		(401)
Total recognized in net periodic benefit cost and
	other comprehensive (income) loss	$	(306)	$	447	$	(249)

Estimated amounts that will be amortized from accumulated other comprehensive loss over the next fiscal year:

							Other Post-
	Pension Plans						Retirement
	Foreign		U.S.		Total		Benefits
Actuarial loss	$	769	$	2,330	$	3,099	$	—
Prior service credit		(169)		—		(169)		—
	$	600	$	2,330	$	2,930	$	—

Weighted-average assumptions used to determine benefit obligations as of December 31, 2018 and 2017:

					Other Postretirement
	Pension Benefits				Benefits
	2018		2017		2018		2017
U.S. Plans:
Discount rate	4.07	%	3.44	%	4.03	%	3.39	%
Rate of compensation increase	3.63	%	3.63	%	N/A		N/A

Foreign Plans:
Discount rate	2.47	%	2.31	%	N/A		N/A
Rate of compensation increase	2.89	%	2.89	%	N/A		N/A

Weighted-average assumptions used to determine net periodic benefit costs for the years ended December 31, 2018 and 2017:

						Other Postretirement
		Pension Benefits				Benefits
		2018		2017		2018		2017
U.S. Plans:
Discount rate		3.44	%	3.88	%	3.39	%	3.73	%
Expected long-term return on
	plan assets	5.95	%	7.00	%	N/A		N/A
Rate of compensation increase		3.63	%	3.63	%	N/A		N/A

Foreign Plans:
Discount rate		2.33	%	2.17	%	N/A		N/A
Expected long-term return on
	plan assets	2.22	%	2.12	%	N/A		N/A
Rate of compensation increase		2.89	%	2.48	%	N/A		N/A

The long-term rates of return on assets were selected from within the reasonable range of rates determined by (a) historical real returns for the asset classes covered by the investment policy and (b) projections of inflation over the long-term period during which benefits are payable to plan participants. See Note 1 of Notes to Consolidated Financial Statements for further information.

Assumed health care cost trend rates as of December 31, 2018 and 2017:

		2018		2017
Health care cost trend rate for next year		6.20	%	6.40	%
Rate to which the cost trend rate is assumed to decline (the
	ultimate trend rate)	4.50	%	4.50	%
Year that the rate reaches the ultimate trend rate		2037		2037

Assumed health care cost trend rates could have a significant effect on the amounts reported for the health care plans. A one-percentage-point change in assumed health care cost trend rates would have the following effects:

		1% Point		1% Point
		Increase		Decrease
Effect on total service and interest cost	$	11	$	(9)
Effect on postretirement benefit obligations		299		(311)

Plan Assets and Fair Value

The Company’s pension plan target asset allocation and the weighted-average asset allocations as of December 31, 2018 and 2017 by asset category were as follows:

Asset Category		Target		2018		2017
U.S. Plans
Equity securities		10	%	9	%	59	%
Debt securities		89	%	90	%	40	%
Other		1	%	1	%	1	%
	Total	100	%	100	%	100	%

Foreign Plans
Equity securities and other		24	%	24	%	25	%
Debt securities		76	%	76	%	75	%
	Total	100	%	100	%	100	%

During the year ended December 31, 2018, the Company elected to adjust its U.S. Plans’ asset allocation along a glide path based on the funded status of the U.S. Plan. As funded status improved, the assets were allocated more heavily to debt securities with lengthened duration to match projected liability movements.

As of December 31, 2018 and 2017, “Other” consisted principally of cash and cash equivalents (approximately 1% of plan assets in each respective period).

The following is a description of the valuation methodologies used for the investments measured at fair value, including the general classification of such instruments pursuant to the valuation hierarchy, where applicable:

Cash and Cash Equivalents

Cash and cash equivalents consist of cash and money market funds and are classified as Level 1 investments.

Common Stock

Common stock is valued based on quoted market prices on an exchange in an active market and is classified as Level 1 investments.

Commingled Funds

Investments in the U.S. pension plan and foreign pension plan commingled funds represent pooled institutional investments, including primarily collective investment trusts. These commingled funds are not available on an exchange or in an active market and these investments are valued using their net asset value (“NAV”), which is generally based on the underlying asset values of the pooled investments held in the trusts.

As of December 31, 2018, the U.S. pension plan commingled funds included approximately 10 percent of investments in equity securities and 90 percent of investments in fixed income securities. As of December 31, 2018, foreign pension plan commingled funds included approximately 30 percent of investments in equity securities, 60 percent of investments in fixed income securities, and 10 percent of other non-related investments, primarily real estate.

Pooled Separate Accounts

Investments in the U.S. pension plan pooled separate accounts consist of insurance annuity contracts and are valued based on the reported unit value at year end. Units of the pooled separate account are not traded on an exchange or in an active market and these investments are valued using their NAV.

Insurance Contract

Investments in the foreign pension plan insurance contract are valued at the highest value available for the Company at year end, either the reported cash surrender value of the contract or the vested benefit obligation. Both the cash surrender value and the vested benefit obligation are determined based on unobservable inputs, which are contractually or actuarially determined, regarding returns, fees, the present value of the future cash flows of the contract and benefit obligations. The contract is classified as a Level 3 investment.

Diversified Equity Securities - Registered Investment Companies

Investments in the foreign pension plans diversified equity securities of registered investment companies are based upon the quoted redemption value of shares in the fund owned by the plan at year end. The shares of the fund are not available on an exchange or in an active market; however, the fair value is determined based on the underlying investments in the fund as traded on an exchange in an active market and are classified as Level 2 investments.

Fixed Income – Foreign Registered Investment Companies

Investments in the foreign pension plans fixed income securities of foreign registered investment companies are based upon the quoted redemption value of shares in the fund owned by the plan at year end. The shares of the fund are not available on an exchange or in an active market; however, the fair value is determined based on the underlying investments in the fund as traded on an exchange in an active market and are classified as Level 2 investments.

Real Estate

The foreign pension plan’s investment in real estate consists of an investment in a property fund. The fund’s underlying investments consist of real property, which are valued using unobservable inputs. The property fund is classified as a Level 3 investment.

As of December 31, 2018 and 2017, the U.S. and foreign plans’ investments measured at fair value on a recurring basis were as follows:

						Fair Value Measurements at December 31, 2018
				Total			Using Fair Value Hierarchy
U.S. Pension Assets				Fair Value			Level 1		Level 2		Level 3
Cash and cash equivalents				$	450		$	450	$	—	$	—
	Subtotal U.S. pension plan assets in fair value hierarchy			$	450		$	450	$	—	$	—
Commingled funds measured at NAV					48,965
		Total U.S. pension plan assets		$	49,415

Foreign Pension Assets
Cash and cash equivalents				$	209		$	209	$	—	$	—
Insurance contract					79,873			—		—		79,873
Diversified equity securities - registered investment companies					7,701			—		7,701		—
Fixed income - foreign registered investment companies					2,658			—		2,658		—
Real estate - registered investment companies					2,382			—		—		2,382
	Sub-total of foreign pension assets in fair value hierarchy			$	92,823		$	209	$	10,359	$	82,255
Commingled funds measured at NAV					2,003
		Total foreign pension assets		$	94,826

			Total pension assets in fair value hierarchy	$	93,273		$	659	$	10,359	$	82,255
			Total pension assets measured at NAV		50,968
			Total pension assets	$	144,241

						Fair Value Measurements at December 31, 2017
				Total			Using Fair Value Hierarchy
U.S. Pension Assets				Fair Value			Level 1		Level 2		Level 3
Cash and cash equivalents				$	449		$	449	$	—	$	—
Small capitalization common stock					1,508			1,508		—		—
	Subtotal U.S. pension plan assets in fair value hierarchy			$	1,957		$	1,957	$	—	$	—
Commingled funds measured at NAV					48,527
Pooled separate accounts measured at NAV					1,480
		Total U.S. pension plan assets		$	51,964

Foreign Pension Assets
Cash and cash equivalents				$	26		$	26	$	—	$	—
Insurance contract					82,092			—		—		82,092
Diversified equity securities - registered investment companies					9,002			—		9,002		—
Fixed income - foreign registered investment companies					2,951			—		2,951		—
Real estate - registered investment companies					2,428			—		—		2,428
	Subtotal foreign pension assets in fair value hierarchy			$	96,499		$	26	$	11,953	$	84,520
Commingled funds measured at NAV					2,123
		Total foreign pension plan assets		$	98,622

			Total pension assets in fair value hierarchy	$	98,456		$	1,983	$	11,953	$	84,520
			Total pension assets measured at NAV		52,130
			Total pension assets	$	150,586

Certain investments that are measured at fair value using the NAV per share (or its equivalent) have not been classified in the fair value hierarchy. The fair value amounts presented for these investments in the preceding tables are intended to permit reconciliation of the fair value hierarchies to the line items presented in the statements of net assets available for benefits.

Changes in the fair value of the foreign plans’ Level 3 investments during the years ended December 31, 2018 and 2017 were as follows:

			Insurance		Real Estate
			Contract		Fund		Total
Balance as of December 31, 2016		$	72,778	$	2,041	$	74,819
	Purchases		2,350		—		2,350
	Settlements		(1,661)		—		(1,661)
	Unrealized (losses) gains		(1,425)		188		(1,237)
	Currency translation adjustment		10,050		199		10,249
Balance as of December 31, 2017			82,092		2,428		84,520
	Purchases		4,707		—		4,707
	Settlements		(1,399)		—		(1,399)
	Unrealized (losses) gains		(1,817)		94		(1,723)
	Currency translation adjustment		(3,710)		(140)		(3,850)
Balance as of December 31, 2018		$	79,873	$	2,382	$	82,255

U.S. pension assets include Company common stock in the amount of $1.5 million (3% of total U.S. plan assets) as of December 31, 2017.

During the second quarter of 2017, the Company’s primary noncontributory U.S. pension plan (the “U.S. Pension Plan”) offered a cash settlement to its vested terminated participants, which allowed them to receive the value of their pension benefits as a single lump sum payment. As payments from the U.S. Pension Plan for this cash out offering exceeded the service and interest cost components of the U.S. Pension Plan expense for the year ended December 31, 2017, the Company recorded a settlement charge of approximately $1.9 million. This settlement charge represented the immediate recognition into expense of a portion of the unrecognized loss within AOCI on the balance sheet in proportion to the share of the projected benefit obligation that was settled by these payments. The gross pension benefit obligation was reduced by approximately $4.0 million as a result of these payments. The settlement charge was recognized through other expense, net, on the Company’s Consolidated Statements of Income.

In the fourth quarter of 2018, the Company began the process of terminating the U.S. Pension Plan after receiving Board of Director approval to do so. Prior to December 31, 2005, the U.S. Pension Plan covered substantially all employees of the Company’s U.S. subsidiary who had at least one year of eligible service and had attained age 21. Effective December 31, 2005, the U.S. Pension Plan was amended to freeze benefit accruals with respect to participants who were not part of a collective bargaining unit and effective after November 30, 2013, the U.S. Pension Plan was further amended to freeze benefit accruals for the remaining members of a collective bargaining unit. U.S. Pension Plan participants will have their benefits either converted into a lump sum cash payment or an annuity contract placed with an insurance carrier. The U.S. Pension Plan is fully-funded on a U.S. GAAP basis. In order to terminate the plan in accordance with IRS and pension benefit guaranty corporation requirements, the Company will be required to fully fund the plan on a termination basis and will commit to contribute the additional assets necessary, if any, to do so. The amount necessary to do so is not yet known but is currently estimated to be between $0 and $10 million. In addition, the Company expects to record a pension settlement charge at plan termination. This settlement charge will include the immediate recognition into expense of the unrecognized losses within AOCI on the balance sheet as of the plan termination date. The Company does not have a current estimate for this future settlement charge, however, the gross AOCI related to this plan was approximately $19 million as of December 31, 2018. The Company currently estimates that the U.S. Pension Plan termination will be completed during 2020.

Cash Flows

Contributions

The Company expects to make minimum cash contributions of approximately $5.2 million to its pension plans (approximately $0.5 million U.S. and $4.7 million Foreign) and approximately $0.4 million to its other postretirement benefit plan in 2019.

Estimated Future Benefit Payments

Excluding any impact related to the U.S. Pension Plan termination process noted above, the following benefit payments, which reflect expected future service, as appropriate, are expected to be paid:

							Other Post-
	Pension Benefits						Retirement
	Foreign		U.S.		Total		Benefits
2019	$	2,240	$	4,515	$	6,755	$	446
2020		2,443		4,286		6,729		422
2021		3,166		4,220		7,386		393
2022		3,124		4,237		7,361		367
2023		3,336		4,860		8,196		349
2024 to 2028		19,212		22,107		41,319		1,380

The Company maintains a plan under which supplemental retirement benefits are provided to certain officers. Benefits payable under the plan are based on a combination of years of service and existing postretirement benefits. Included in total pension costs are charges of $1.6 million, $1.4 million and $0.9 million for the years ended December 31, 2018, 2017 and 2016, respectively, representing the annual accrued benefits under this plan.

Defined Contribution Plan

The Company has a 401(k) plan with an employer match covering a majority of its U.S. employees. The plan allows for and the Company previously paid a nonelective contribution on behalf of participants who have completed one year of service equal to 3% of the eligible participants’ compensation in the form of Company common stock. During the first quarter of 2017, the Company began matching both non-elective and elective 401(k) contributions in cash, rather than stock. Total Company contributions were $3.1 million, $2.9 million and $2.7 million for the years ended December 31, 2018, 2017 and 2016, respectively.

Other Non-Current Liabilities

12 Months Ended

Dec. 31, 2018

Other Non-Current Liabilities [Abstract]

Other Non-Current Liabilities [Text Block]

Note 21 – Other Non-Current Liabilities

Other non-current liabilities as of December 31, 2018 and 2017 were as follows:

	2018		2017
Restricted insurance settlement	$	20,278	$	21,171
Non-current income taxes payable		7,644		15,825
Uncertain tax positions (includes interest and penalties)		8,097		7,970
Deferred and other long-term compensation		6,886		5,905
Other		624		625
Total other non-current liabilities	$	43,529	$	51,496

Equity and Noncontrolling Interest

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Stockholders' Equity Note Disclosure [Text Block]

Note 22 – Equity and Accumulated Other Comprehensive Loss

In May 2015, the Company’s Board of Directors authorized a share repurchase program for the repurchase of up to $100.0 million of Quaker Chemical Corporation common stock (the “2015 Share Repurchase Program”). The 2015 Share Repurchase Program has no expiration date. The 2015 Share Repurchase Program provides a framework of conditions under which management can repurchase shares of the Company’s common stock. These purchases may be made in the open market or in private and negotiated transactions and will be in accordance with applicable laws, rules and regulations.

In connection with the 2015 Share Repurchase Program, the Company acquired 83,879 shares of common stock for $5.9 million, during the year ended December 31, 2016. There were no share repurchases under the 2015 Share Repurchase Program during the years ended December 31, 2018 and 2017. The Company has elected not to hold treasury shares and therefore has retired the shares as they are repurchased. It is the Company’s accounting policy to record the excess paid over par value as a reduction in retained earnings for all shares repurchased.

The Company has 30,000,000 shares of common stock authorized with a par value of $1, and 13,338,026 and 13,307,976 shares issued and outstanding as of December 31, 2018 and 2017, respectively. The change in shares issued and outstanding during 2018 was primarily related to 17,596 shares issued for equity-based compensation plans, 3,574 shares issued for the ESPP and 8,880 shares issued for the exercise of stock options and other employee and director-related share activity.

The Company is authorized to issue 10,000,000 shares of preferred stock with $1 par value, subject to approval by the Board of Directors. The Board of Directors may designate one or more series of preferred stock and the number of shares, rights, preferences, and limitations of each series. As of December 31, 2018, no preferred stock had been issued.

The following table shows the reclassifications from and resulting balances of AOCI for the years ended December 31, 2018, 2017 and 2016:

						Unrealized Gain (Loss) in
				Defined		Unrealized Gain (Loss) in
		Currency		Benefit		Available-for-
		Translation		Pension		Sale
		Adjustments		Plans		Securities		Total
Balance as of December 31, 2015		$	(38,544)	$	(35,251)	$	479	$	(73,316)
	Other comprehensive (loss) income before reclassifications		(13,711)		(4,229)		834		(17,106)
	Amounts reclassified from AOCI		—		3,075		(17)		3,058
	Related tax amounts		—		237		(280)		(43)
Balance as of December 31, 2016			(52,255)		(36,168)		1,016		(87,407)
	Other comprehensive income (loss) before reclassifications		20,362		(1,646)		2,299		21,015
	Amounts reclassified from AOCI		—		5,154		(2,494)		2,660
	Related tax amounts		—		(1,433)		65		(1,368)
Balance as of December 31, 2017			(31,893)		(34,093)		886		(65,100)
	Other comprehensive (loss) income before reclassifications		(17,429)		1,543		(2,622)		(18,508)
	Amounts reclassified from AOCI		—		3,085		435		3,520
	Related tax amounts		—		(1,086)		459		(627)
Balance as of December 31, 2018		$	(49,322)	$	(30,551)	$	(842)	$	(80,715)

Approximately 30% and 70% of the amounts reclassified from AOCI to the Consolidated Statements of Income for defined benefit retirement plans during the years ended December 31, 2018, 2017 and 2016 were recorded in COGS and SG&A, respectively. See Note 20 of Notes to Consolidated Financial Statements for further information. All reclassifications related to unrealized gain (loss) in available-for-sale securities relate to the Company’s equity interest in a captive insurance company and are recorded in equity in net income of associated companies. The amounts reported on the Consolidated Statements of Changes in Equity for non-controlling interest are related to currency translation adjustments.

Business Acquisitions	12 Months Ended
Business Acquisitions	Dec. 31, 2018
Business Combinations [Abstract]
Business Combination Disclosure [Text Block]	Note 23 – Business Acquisitions In March 2018, the Company purchased certain formulations and product technology for the mining industry for its North America reportable operating segment for $1.0 million. The Company allocated the entire purchase price to intangible assets representing formulations and product technology, to be amortized over 10 years. In accordance with the terms of the agreement, $0.5 million of the purchase price was paid at signing, with the remaining $0.5 million of the purchase price being paid during the first quarter of 2019. As of December 31, 2018, the remaining $0.5 million was recorded in Other current liabilities on the Company’s Consolidated Balance Sheet. In December 2017, the Company acquired the remaining 45% ownership interest in its India affiliate, Quaker Chemical India Private Limited (“QCIL”) for 2,025.0 million INR, or approximately $31.8 million. QCIL is a part of the Company’s Asia/Pacific reportable operating segment. As this acquisition was a change in an existing controlling ownership, the Company recorded $21.2 million of excess purchase price over the carrying value of the noncontrolling interest in Capital in excess of par value. In May 2017, the Company acquired assets associated with a business that markets, sells and manufactures certain metalworking fluids for its North America reportable operating segment for 7.3 million CAD, or approximately $5.4 million. As of December 31, 2018, the allocation of the purchase price for all of the Company’s 2017 acquisitions have been finalized. In November 2016, the Company acquired Lubricor Inc. and its affiliated entities (“Lubricor”), a metalworking fluids manufacturer headquartered in Waterloo, Ontario for its North America reportable operating segment for 16.0 million CAD, or approximately $12.0 million. During the first quarter of 2017, the Company identified and recorded an adjustment of less than $0.1 million to the allocation of the purchase price for the Lubricor acquisition. The adjustment was the result of finalizing a post-closing settlement based on the Company’s assessment of additional information related to assets acquired and liabilities assumed. In May 2016, the Company acquired assets of a business that is associated with dust control products for the mining industry for its North America reportable operating segment for $1.9 million. As of December 31, 2017, the allocation of the purchase price for all of the Company’s 2016 acquisitions have been finalized. In July 2015, the Company acquired Verkol, a leading specialty grease and other lubricants manufacturer based in northern Spain, included in its EMEA reportable operating segment, for 37.7 million EUR, or approximately $41.4 million. This includes a post-closing adjustment of 1.3 million EUR, or approximately $1.4 million that was accrued as of December 31, 2015 and paid during the first quarter of 2016. The results of operations of the acquired businesses and assets are included in the Consolidated Statements of Income from their respective acquisition dates. Transaction expenses associated with these acquisitions are included in SG&A in the Company’s Consolidated Statements of Income. Certain pro forma and other information is not presented, as the operations of the acquired businesses are not material to the overall operations of the Company for the periods presented.

Fair Value Measurements

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value Disclosures [Text Block]

Note 24 – Fair Value Measures

The Company has valued its company-owned life insurance policies at fair value. These assets are subject to fair value measurement as follows:

			Fair Value Measurements at December 31, 2018
	Total			Using Fair Value Hierarchy
Assets	Fair Value			Level 1		Level 2		Level 3
Company-owned life insurance	$	1,491		$	—	$	1,491	$	—
Total	$	1,491		$	—	$	1,491	$	—

			Fair Value Measurements at December 31, 2017
	Total			Using Fair Value Hierarchy
Assets	Fair Value			Level 1		Level 2		Level 3
Company-owned life insurance	$	1,594		$	—	$	1,594	$	—
Total	$	1,594		$	—	$	1,594	$	—

The fair values of Company-owned life insurance are based on quotes for like instruments with similar credit ratings and terms. The Company did not have liabilities subject to fair value measurement and did not hold Level 3 investments as of December 31, 2018 or 2017, respectively, so related disclosures have not been included.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Commitments and Contingencies

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments And Contingencies Disclosure [Text Block]

Note 25 – Commitments and Contingencies

In 1992, the Company identified certain soil and groundwater contamination at AC Products, Inc. (“ACP”), a wholly owned subsidiary. In voluntary coordination with the Santa Ana California Regional Water Quality Board, ACP has been remediating the contamination, the principal contaminant of which is perchloroethylene (“PERC”). In 2004, the Orange County Water District (“OCWD”) filed a civil complaint against ACP and other parties seeking to recover compensatory and other damages related to the investigation and remediation of the contamination in the groundwater. Pursuant to a settlement agreement with OCWD, ACP agreed, among other things, to operate the two groundwater treatment systems to hydraulically contain groundwater contamination emanating from ACP’s site until the concentrations of PERC released by ACP fell below the current Federal maximum contaminant level for four consecutive quarterly sampling events. In 2014, ACP ceased operation at one of its two groundwater treatment systems, as it had met the above condition for closure. As of December 31, 2018, ACP believes it is close to meeting the conditions for closure of the remaining groundwater treatment system but continues to operate this system while in discussions with the relevant authorities.

As of December 31, 2018, the Company believes that the range of potential-known liabilities associated with the balance of ACP water remediation program is approximately $0.1 million to $1.0 million. The low and high ends of the range are based on the length of operation of the treatment system as required by the conditions noted above, as determined by groundwater modeling. Costs of operation include the operation and maintenance of the extraction well, groundwater monitoring and program management.

The Company believes, although there can be no assurance regarding the outcome of other unrelated environmental matters, that it has made adequate accruals for costs associated with other environmental problems of which it is aware. Approximately $0.2 million was accrued as of December 31, 2018 and 2017, respectively, to provide for such anticipated future environmental assessments and remediation costs.

An inactive subsidiary of the Company that was acquired in 1978 sold certain products containing asbestos, primarily on an installed basis, and is among the defendants in numerous lawsuits alleging injury due to exposure to asbestos. The subsidiary discontinued operations in 1991 and has no remaining assets other than proceeds received from insurance settlements. To date, the overwhelming majority of these claims have been disposed of without payment and there have been no adverse judgments against the subsidiary. Based on a continued analysis of the existing and anticipated future claims against this subsidiary, it is currently projected that the subsidiary’s total liability over the next 50 years for these claims is approximately $1.7 million (excluding costs of defense). Although the Company has also been named as a defendant in certain of these cases, no claims have been actively pursued against the Company, and the Company has not contributed to the defense or settlement of any of these cases pursued against the subsidiary. These cases were handled by the subsidiary’s primary and excess insurers who had agreed in 1997 to pay all defense costs and be responsible for all damages assessed against the subsidiary arising out of existing and future asbestos claims up to the aggregate limits of their policies. A significant portion of this primary insurance coverage was provided by an insurer that is insolvent, and the other primary insurers asserted that the aggregate limits of their policies had been exhausted. The subsidiary challenged the applicability of these limits to the claims being brought against the subsidiary. In response, two of the three carriers entered into separate settlement and release agreements with the subsidiary in 2005 and 2007 for $15.0 million and $20.0 million, respectively. The proceeds of both settlements are restricted and can only be used to pay claims and costs of defense associated with the subsidiary’s asbestos litigation. In 2007, the subsidiary and the remaining primary insurance carrier entered into a Claim Handling and Funding Agreement, under which the carrier is paying 27% of defense and indemnity costs incurred by or on behalf of the subsidiary in connection with asbestos bodily injury claims. The agreement continues until terminated and can only be terminated by either party by providing a minimum of two years prior written notice. As of December 31, 2018, no notice of termination has been given under this agreement. At the end of the term of the agreement, the subsidiary may choose to again pursue its claim against this insurer regarding the application of the policy limits. The Company believes that, if the coverage issues under the primary policies with the remaining carrier are resolved adversely to the subsidiary and all settlement proceeds were used, the subsidiary may have limited additional coverage from a state guarantee fund established following the insolvency of one of the subsidiary’s primary insurers. Nevertheless, liabilities in respect of claims may exceed the assets and coverage available to the subsidiary.

If the subsidiary’s assets and insurance coverage were to be exhausted, claimants of the subsidiary may actively pursue claims against the Company because of the parent-subsidiary relationship. The Company does not believe that such claims would have merit or that the Company would be held to have liability for any unsatisfied obligations of the subsidiary as a result of such claims. After evaluating the nature of the claims filed against the subsidiary and the small number of such claims that have resulted in any payment, the potential availability of additional insurance coverage at the subsidiary level, the additional availability of the Company’s own insurance and the Company’s strong defenses to claims that it should be held responsible for the subsidiary’s obligations because of the parent-subsidiary relationship, the Company believes it is not probable that the Company will incur losses. The Company has been successful to date having any claims naming it dismissed during initial proceedings. Since the Company may be in this stage of litigation for some time, it is not possible to estimate additional losses or range of loss, if any.

The Company is party to other litigation which management currently believes will not have a material adverse effect on the Company’s results of operations, cash flows or financial condition.

The Company leases certain manufacturing and office facilities and equipment under non-cancelable operating leases with various terms from 1 to 15 years expiring in 2027. Rent expense for the years ended December 31, 2018, 2017 and 2016 was $7.2 million, $6.4 million, and $5.6 million, respectively.

The Company’s minimum rental commitments under operating leases as of December 31, 2018 for future years were approximately:

2019	$	7,068
2020		5,635
2021		4,509
2022		3,523
2023		2,659
2024 and beyond		7,779

Quarterly Results - Unaudited

12 Months Ended

Dec. 31, 2018

Quarterly Results (unaudited) [Abstract]

Quarterly Results - Unaudited [Text Block]

Note 26 – Quarterly Results (unaudited)

			First		Second		Third		Fourth
			Quarter (1)		Quarter (2)		Quarter (3)		Quarter (4)
2018
	Net sales		$	212,055	$	221,962	$	222,022	$	211,481
	Gross profit			75,447		80,937		81,093		74,838
	Operating income			20,231		22,563		24,919		20,068
	Net income attributable to Quaker Chemical Corporation			12,732		19,246		19,690		7,805
	Net income attributable to Quaker Chemical Corporation
		Common Shareholders - Basic (5)	$	0.96	$	1.44	$	1.48	$	0.59
	Net income attributable to Quaker Chemical Corporation
		Common Shareholders - Diluted (5)	$	0.95	$	1.44	$	1.47	$	0.58

2017
	Net sales		$	194,909	$	201,183	$	212,918	$	211,072
	Gross profit			70,887		71,835		74,776		73,997
	Operating income			13,758		17,903		14,009		17,074
	Net income (loss) attributable to Quaker Chemical Corporation			6,992		11,906		11,142		(9,762)
	Net income (loss) attributable to Quaker Chemical Corporation
		Common Shareholders - Basic (5)	$	0.53	$	0.90	$	0.84	$	(0.73)
	Net income (loss) attributable to Quaker Chemical Corporation
		Common Shareholders - Diluted (5)	$	0.52	$	0.89	$	0.83	$	(0.73)

(1) Net income attributable to Quaker Chemical Corporation for both the first quarters of 2018 and 2017 includes a loss of $0.4 million and earnings of $0.6 million, respectively, from the Company’s equity interest in a captive insurance company. Net income attributable to Quaker Chemical Corporation for both the first quarters of 2018 and 2017 includes Houghton combination-related expenses of $6.1 million and $9.1 million, respectively. Net income attributable to Quaker Chemical Corporation for the first quarter of 2018 includes a currency conversion charge of $0.2 million related to the impacts of hyper-inflationary accounting at the Company’s 50% owned affiliate in Venezuela. Net income attributable to Quaker Chemical Corporation for the first quarter of 2017 also includes $0.3 million of cost streamlining expenses associated with certain actions taken to reorganize the Company’s corporate staff.

(2) Net income attributable to Quaker Chemical Corporation for both the second quarters of 2018 and 2017 includes earnings from the Company’s equity interest in a captive insurance company of $1.0 million and $0.4 million, respectively. Net income attributable to Quaker Chemical Corporation for both the second quarters of 2018 and 2017 includes Houghton combination-related expenses of $4.5 million and $4.3 million, respectively. Net income attributable to Quaker Chemical Corporation for both the second quarters of 2018 and 2017 includes currency conversion charges of less than $0.1 million and $0.3 million, respectively, related to the impacts of hyper-inflationary accounting at the Company’s 50% owned affiliate in Venezuela. Net income attributable to Quaker Chemical Corporation for the second quarter of 2018 includes a tax adjustment of $1.2 million related to U.S. Tax Reform. Net income attributable to Quaker Chemical Corporation for the second quarter of 2017 includes a $1.9 million charge for the Company’s U.S. pension plan settlement of its vested terminated participants.

(3) Net income attributable to Quaker Chemical Corporation for both the third quarters of 2018 and 2017 includes earnings from the Company’s equity interest in a captive insurance company of $0.4 million, respectively, in both periods. Net income attributable to Quaker Chemical Corporation for both the third quarters of 2018 and 2017 includes Houghton combination-related expenses of $3.8 million and $9.7 million, respectively. Net income attributable to Quaker Chemical Corporation for both the third quarters of 2018 and 2017 includes currency conversion charges of $0.5 million and less than $0.1 million, respectively, related to the impacts of hyper-inflationary accounting at the Company’s 50% owned affiliate in Venezuela and wholly owned Argentina subsidiary. Net income attributable to Quaker Chemical Corporation for the third quarter of 2018 also includes a $0.4 million foreign currency transaction gain related to the liquidation of an inactive legal entity and a tax adjustment of $1.1 million related to U.S. Tax Reform.

(4) Net income (loss) attributable to Quaker Chemical Corporation for both the fourth quarters of 2018 and 2017 includes a loss of $0.1 million and earnings of $1.1 million, respectively, from the Company’s equity interest in a captive insurance company. Net income (loss) attributable to Quaker Chemical Corporation for both the fourth quarters of 2018 and 2017 includes Houghton combination-related expenses of $5.1 million and $7.7 million, respectively. Net income (loss) attributable to Quaker Chemical Corporation for both the fourth quarters of 2018 and 2017 includes other income of $0.1 million and $0.6 million, respectively, related to cash proceeds from an insolvent insurance carrier with respect to previously filed recovery claims by an inactive subsidiary of the Company. Net income (loss) attributable to Quaker Chemical Corporation for both the fourth quarters of 2018 and 2017 includes currency conversion impacts related to hyper-inflationary accounting, with the 2017 impact of a charge of $0.1 million at the Company’s 50% owned affiliate in Venezuela and the 2018 impact of income of less than $0.1 million at the Company’s wholly owned Argentina subsidiary. Net income (loss) attributable to Quaker Chemical Corporation for both the fourth quarters of 2018 and 2017 includes charges of $8.1 million and $22.2 million, respectively, related to U.S. Tax Reform. Net income (loss) attributable to Quaker Chemical Corporation for the fourth quarter of 2017 also includes a charge of $0.1 million related to a loss on disposal of a held-for-sale asset.

(5) Basic and diluted per share amounts of net income (loss) attributable to Quaker Chemical Corporation common shareholders for all four quarters above may not total to the full year amounts presented in the Company’s consolidated financial statements for the years ended December 31, 2018 and 2017, respectively, due to rounding

Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Consolidation, Policy [Policy Text Block]

All majority-owned subsidiaries are included in the Company’s consolidated financial statements, with appropriate elimination of intercompany balances and transactions.

Consolidation, Variable Interest Entity, Policy [Policy Text Block]

The Company is not the primary beneficiary of any variable interest entities (“VIEs”) and therefore the Company’s consolidated financial statements do not include the accounts of any VIEs.

Equity and Cost Method Investments, Policy [Policy Text Block]

Investments in associated companies (less than majority-owned and in which the Company has significant influence) are accounted for under the equity method. The Company’s share of net income or losses in these investments in associated companies is included in the Consolidated Statements of Income. The Company periodically reviews these investments for impairments and, if necessary, would adjust these investments to their fair value when a decline in market value or other impairment indicators are deemed to be other than temporary.

Foreign Currency Transactions and Translations Policy [Policy Text Block]

Cash and Cash Equivalents, Policy [Policy Text Block]

Inventory, Policy [Policy Text Block]

Inventories: Inventories are valued at the lower of cost or net realizable value, and are valued using the first-in, first-out method.

Property, Plant and Equipment, Policy [Policy Text Block]

Internal Use Software, Policy [Policy Text Block]

Goodwill and Intangible Assets, Policy [Policy Text Block]

Revenue From Contract With Customer [Policy Text Block]

Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy [Policy Text Block]

Research and Development Expense, Policy [Policy Text Block]

Research and development costs: Research and development costs are expensed as incurred and are included in selling, general and administrative expenses (“SG&A”).

Environmental Costs, Policy [Policy Text Block]

Asset Retirement Obligations, Policy [Policy Text Block]

Pension and Other Postretirement Plans, Policy [Policy Text Block]

Comprehensive Income, Policy [Policy Text Block]

Income Tax, Policy [Policy Text Block]

Income Tax Uncertainties, Policy [Policy Text Block]

The FASB’s guidance regarding accounting for uncertainty in income taxes prescribes the recognition threshold and measurement attributes for financial statement recognition and measurement of tax positions taken or expected to be taken on a tax return. The guidance further requires the determination of whether the benefits of tax positions are probable or more likely than not sustained upon audit based upon the technical merits of the tax position. For tax positions that are determined to be more likely than not sustained upon audit, a company recognizes the largest amount of benefit that is greater than 50% likely of being realized upon ultimate settlement in the financial statements. For tax positions that are not determined to be more likely than not sustained upon audit, a company does not recognize any portion of the benefit in the financial statements. Additionally, the Company monitors and adjusts for derecognition, classification, and penalties and interest in interim periods, with appropriate disclosure and transition thereto. Also, the amount of interest expense and income related to uncertain tax positions is computed by applying the applicable statutory rate of interest to the difference between the tax position recognized, including timing differences, and the amount previously taken or expected to be taken in a tax return. The Company’s continuing practice is to recognize interest and/or penalties related to income tax matters in income tax expense. Finally, when applicable, the Company nets its liability for unrecognized tax benefits against deferred tax assets related to net operating losses or other tax credit carryforwards that would apply if the uncertain tax position were settled for the presumed amount at the balance sheet date.

Derivatives, Policy [Policy Text Block]

Fair Value of Financial Instruments, Policy [Policy Text Block]

	•	Level 1: Observable inputs such as quoted prices (unadjusted) in active markets for identical assets or liabilities.
	•	Level 2: Inputs other than quoted prices that are observable for the asset or liability, either directly or indirectly. These include quoted prices for similar assets or liabilities in active markets and quoted prices for identical or similar assets or liabilities in markets that are not active.
	•	Level 3: Unobservable inputs that reflect the reporting entity's own assumptions.

Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]

Earnings Per Share, Policy [Policy Text Block]

Segment Reporting, Policy [Policy Text Block]

Business Combinations Policy [Policy Text Block]

Costs Associated with Exit or Disposal Activities or Restructurings, Policy [Policy Text Block]

Reclassification, Policy [Policy Text Block]

Use of Estimates, Policy [Policy Text Block]

Net Sales and Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2018

Disaggregation Of Revenue [Abstract]

Disaggregation Of Revenue [Table Text Block]

	2018		2017		2016
Rolling lubricants	16.9	%	17.8	%	19.0	%
Machining and grinding compounds	16.1	%	15.8	%	14.9	%
Corrosion preventives	11.6	%	11.4	%	11.8	%
Hydraulic fluids	11.4	%	11.6	%	12.0	%
Specialty greases	9.7	%	10.0	%	10.1	%

	2018
	North						South		Consolidated
	America		EMEA		Asia/Pacific		America		Total
Net sales	$	383,471	$	233,597	$	214,157	$	36,295	$	867,520

Customer Industries
Primary metals	$	156,906	$	102,417	$	134,395	$	19,818	$	413,536
Metalworking		167,829		116,076		74,867		14,827		373,599
Coatings and other		58,736		15,104		4,895		1,650		80,385
	$	383,471	$	233,597	$	214,157	$	36,295	$	867,520

Timing of Revenue Recognized
Product sales at a point in time	$	372,392	$	233,372	$	206,112	$	36,010	$	847,886
Services transferred over time		11,079		225		8,045		285		19,634
	$	383,471	$	233,597	$	214,157	$	36,295	$	867,520

Business Segments (Tables)

12 Months Ended

Dec. 31, 2018

Segment Disclosures [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

		2018		2017		2016
Segment assets
	North America (including Corporate)	$	317,934	$	324,260	$	321,404
	EMEA		157,111		177,267		147,021
	Asia/Pacific		212,545		196,891		200,218
	South America		22,075		23,708		23,385
	Total segment assets	$	709,665	$	722,126	$	692,028

		2018		2017		2016
Segment long-lived assets
	North America (including Corporate)	$	84,876	$	88,818	$	86,775
	EMEA		26,239		28,507		25,630
	Asia/Pacific		23,650		22,427		22,040
	South America		2,529		2,691		2,858
	Total segment long-lived assets	$	137,294	$	142,443	$	137,303

		2018		2017		2016
Capital expenditures
	North America (including Corporate)	$	4,574	$	3,919	$	2,918
	EMEA		2,081		3,936		3,263
	Asia/Pacific		6,059		2,458		3,269
	South America		172		559		504
	Total segment capital expenditures	$	12,886	$	10,872	$	9,954

		2018		2017		2016
Depreciation
	North America	$	5,770	$	5,791	$	5,672
	EMEA		3,434		3,368		3,323
	Asia/Pacific		2,552		2,669		2,765
	South America		440		649		672
	Total segment depreciation	$	12,196	$	12,477	$	12,432

		2018		2017		2016
Net sales
	North America	$	383,471	$	356,598	$	336,174
	EMEA		233,597		226,243		200,917
	Asia/Pacific		214,157		201,008		179,131
	South America		36,295		36,233		30,443
	Total net sales	$	867,520	$	820,082	$	746,665

		2018		2017		2016
Operating earnings, excluding indirect operating expenses
	North America	$	88,276	$	77,694	$	77,833
	EMEA		35,970		35,350		33,810
	Asia/Pacific		56,056		48,342		45,866
	South America		3,881		3,927		1,386
	Total operating earnings, excluding indirect operating expenses		184,183		165,313		158,895

Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]

		2018		2017		2016
Operating earnings, excluding indirect operating expenses
	North America	$	88,276	$	77,694	$	77,833
	EMEA		35,970		35,350		33,810
	Asia/Pacific		56,056		48,342		45,866
	South America		3,881		3,927		1,386
Total operating earnings, excluding indirect operating expenses			184,183		165,313		158,895
Non-operating charges			(72,223)		(65,142)		(65,316)
Restructuring and related activities			—		—		439
Combination-related expenses			(16,661)		(29,938)		(1,531)
Depreciation of corporate assets and amortization			(7,518)		(7,489)		(7,134)
Operating income			87,781		62,744		85,353
Other expense, net			(642)		(718)		(492)
Interest expense			(6,158)		(3,892)		(2,889)
Interest income			2,117		2,534		2,037
Income before taxes and equity in net income of
	associated companies	$	83,098	$	60,668	$	84,009

Restructuring Activities (Tables)

12 Months Ended

Dec. 31, 2018

Restructuring And Related Activities [Abstract]

Restructuring and Related Costs [Table Text Block]

		North						South
		America		EMEA		Asia/Pacific		America		Total
Accrued restructuring as of
December 31, 2015		$	1,867	$	4,265	$	135	$	36	$	6,303
	Restructuring credits		—		(439)		—		—		(439)
	Cash payments		(1,671)		(3,404)		(138)		(39)		(5,252)
	Currency translation adjustments		—		52		3		3		58
Accrued restructuring as of
December 31, 2016			196		474		—		—		670
	Restructuring charges and adjustments		(126)		126		—		—		—
	Cash payments		(70)		(605)		—		—		(675)
	Currency translation adjustments		—		5		—		—		5
Accrued restructuring as of
December 31, 2017		$	—	$	—	$	—	$	—	$	—

Share Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]

		2018		2017		2016
Stock options	$	1,053	$	958	$	848
Nonvested restricted stock awards and restricted stock units		2,459		2,935		3,121
Employee stock purchase plan		89		88		87
Non-elective and elective 401(k) matching contribution in stock		—		72		2,124
Director stock ownership plan		123		137		169
Total share-based compensation expense	$	3,724	$	4,190	$	6,349

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

			Weighted		Weighted
			Average		Average
			Exercise		Remaining	Aggregate
		Number of	Price		Contractual	Intrinsic
		Options	(per option)		Term (years)	Value
Options outstanding as of January 1, 2018		111,255	$	97.71
	Options granted	35,842		151.75
	Options exercised	(25,025)		83.96
Options outstanding as of December 31, 2018		122,072	$	116.39	5.0	$	7,185
Options expected to vest after December 31, 2018		86,635	$	125.48	5.3	$	4,312
Options exercisable as of December 31, 2018		35,437	$	94.17	4.2	$	2,873

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

						Weighted
						Average	Weighted			Weighted
					Number	Remaining	Average		Number	Average
Range of					of Options	Contractual	Exercise Price		of Options	Exercise Price
Exercise Prices					Outstanding	Term (years)	(per option)		Exercisable	(per option)
$	50.01	-	$	60.00	874	1.2		58.26	874		58.26
$	60.01	-	$	70.00	—	—		—	—		—
$	70.01	-	$	80.00	42,272	4.1		72.19	19,791		72.26
$	80.01	-	$	90.00	2,797	3.2		87.30	2,797		87.30
$	90.01	-	$	130.00	—	—		—	—		—
$	130.01	-	$	140.00	40,287	5.2		134.60	11,975		134.60
$	140.01	-	$	150.00	—	—		—	—		—
$	150.01	-	$	160.00	35,842	6.2		151.75	—		—
					122,072	5.0		116.39	35,437		94.17

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	2018		2017		2016		2015
Number of stock options granted	35,842		42,477		67,444		38,698
Dividend yield	1.37	%	1.49	%	1.49	%	1.55	%
Expected volatility	24.73	%	25.52	%	28.39	%	36.32	%
Risk-free interest rate	2.54	%	1.67	%	1.08	%	1.22	%
Expected term (years)	4.0		4.0		4.0		4.0

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

		2018		2017		2016
2018 Stock option awards	$	310	$	—	$	—
2017 Stock option awards	$	367	$	308	$	—
2016 Stock option awards	$	332	$	332	$	282
2015 Stock option awards	$	44	$	276	$	276

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

		Weighted
		Average Grant
	Number of	Date Fair Value
	Shares	(per share)
Nonvested awards, December 31, 2017	72,164	$	91.03
Granted	16,166	$	152.38
Vested	(34,954)	$	87.08
Forfeited	(591)	$	121.43
Nonvested awards, December 31, 2018	52,785	$	112.09

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]

		Weighted
		Average Grant
	Number of	Date Fair Value
	Units	(per unit)
Nonvested awards, December 31, 2017	4,277	$	95.53
Granted	1,549	$	153.84
Vested	(1,176)	$	87.30
Nonvested awards, December 31, 2018	4,650	$	117.03

Other Income (Expense) (Tables)

12 Months Ended

Dec. 31, 2018

Other Income and Expenses [Abstract]

Schedule of Other Nonoperating Income (Expense) [Table Text Block]

	2018		2017		2016
Income from third party license fees	$	862	$	861	$	978
Foreign exchange (losses) gains, net		(807)		891		172
Gain (loss) on fixed asset disposals, net		657		(79)		50
Non-income tax refunds and other related credits		668		1,015		398
Pension and postretirement benefit costs, non-service components		(2,285)		(4,234)		(2,302)
Insurance insolvency recovery		90		600		—
Other non-operating income		425		380		338
Other non-operating expense		(252)		(152)		(126)
Total other expense, net	$	(642)	$	(718)	$	(492)

Taxes on Income and Uncertain Positions (Tables)

12 Months Ended

Dec. 31, 2018

Taxes on Income and Uncertain Tax Positions [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

			2018		2017		2016
Current:
	Federal	$	6,583	$	21,265	$	4,680
	State		(1,844)		2,529		518
	Foreign		12,114		14,105		12,540
			16,853		37,899		17,738
Deferred:
	Federal		7,859		6,889		4,601
	State		(173)		(36)		104
	Foreign		511		(3,099)		783
Total		$	25,050	$	41,653	$	23,226

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

		2018		2017		2016
U.S.	$	27,387	$	10,468	$	31,175
Foreign		55,711		50,200		52,834
Total	$	83,098	$	60,668	$	84,009

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

		2018		2017
Retirement benefits	$	3,532	$	5,472
Allowance for doubtful accounts		1,160		1,134
Insurance and litigation reserves		396		497
Postretirement benefits		896		1,056
Supplemental retirement benefits		2,862		2,679
Performance incentives		4,347		3,779
Equity-based compensation		753		1,071
Insurance settlement		4,374		4,581
Operating loss carryforward		8,434		8,602
Foreign tax credit and other credits		1,929		3,043
Uncertain tax positions		(400)		(410)
Other		2,645		2,816
		30,928		34,320
Valuation allowance		(7,520)		(7,401)
Total deferred tax assets, net	$	23,408	$	26,919
Depreciation		4,049		4,444
Foreign pension and other		1,062		1,295
Amortization and other		13,497		15,373
Unremitted Earnings		7,857		—
Total deferred tax liabilities	$	26,465	$	21,112

Schedule of Deferred Income Tax Assets Valuation Allowance [Table Text Block]

								Effect of
		Balance at		Additional		Allowance		Exchange		Balance
		Beginning		Valuation		Utilization		Rate		at End
		of Period		Allowance		and Other		Changes		of Period
Valuation Allowance
Year ended December 31, 2018	$	7,401	$	650	$	(471)	$	(60)	$	7,520
Year ended December 31, 2017	$	6,344	$	1,127	$	(61)	$	(9)	$	7,401
Year ended December 31, 2016	$	6,259	$	294	$	(187)	$	(22)	$	6,344

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

		2018		2017		2016
Income tax provision at the Federal statutory tax rate	$	17,458	$	21,229	$	29,403
Unremitted Earnings		7,857		—		—
Transition Tax		(3,118)		18,388		—
Revaluation of U.S. deferred tax assets and liabilities		—		4,470		—
Global intangible low taxed income		1,211		—		—
Foreign derived intangible income		(1,034)		—		—
Non-deductible acquisition expenses		1,019		4,779		696
Share-based compensation		259		(1,419)		—
Differences in tax rates on foreign earnings and remittances		1,081		(2,663)		(2,862)
Foreign dividends		—		—		2,939
Excess foreign tax credit utilization		—		(2,761)		(5,493)
Research and development activities credit utilization		(230)		(235)		(238)
Uncertain tax positions		(79)		(651)		(833)
U.S. domestic production activities deduction		—		(1,155)		(875)
State income tax provisions, net		196		569		357
Non-deductible entertainment and business meals expense		415		248		238
Miscellaneous items, net		15		854		(106)
Taxes on income before equity in net income of associated companies	$	25,050	$	41,653	$	23,226

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

			2018		2017		2016
Unrecognized tax benefits as of January 1		$	6,761	$	6,240	$	11,032
	Decrease in unrecognized tax benefits taken in prior periods		(183)		(308)		(869)
	Increase in unrecognized tax benefits taken in current period		2,023		2,347		1,921
	Decrease in unrecognized tax benefits due to lapse of statute of limitations		(1,292)		(2,116)		(5,744)
	(Decrease) increase due to foreign exchange rates		(259)		598		(100)
Unrecognized tax benefits as of December 31		$	7,050	$	6,761	$	6,240

Schedule Of Deferred Tax Assets And Liabilities Balance Sheet Classification [Table Text Block]

	2018		2017
Non-current deferred tax assets	$	6,946	$	15,460
Non-current deferred tax liabilities		10,003		9,653
Net deferred tax (liability) asset	$	(3,057)	$	5,807

Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

		2018		2017		2016
Basic earnings per common share
	Net income attributable to Quaker Chemical Corporation	$	59,473	$	20,278	$	61,403
	Less: income allocated to participating securities		(253)		(137)		(515)
	Net income available to common shareholders	$	59,220	$	20,141	$	60,888
	Basic weighted average common shares outstanding		13,268,047		13,204,872		13,136,138
Basic earnings per common share		$	4.46	$	1.53	$	4.64

Diluted earnings per common share
	Net income attributable to Quaker Chemical Corporation	$	59,473	$	20,278	$	61,403
	Less: income allocated to participating securities		(252)		(137)		(514)
	Net income available to common shareholders	$	59,221	$	20,141	$	60,889
	Basic weighted average common shares outstanding		13,268,047		13,204,872		13,136,138
	Effect of dilutive securities		36,685		41,074		24,331
	Diluted weighted average common shares outstanding		13,304,732		13,245,946		13,160,469
Diluted earnings per common share		$	4.45	$	1.52	$	4.63

Restricted Cash (Tables)

12 Months Ended

Dec. 31, 2018

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract]

Schedule Of Cash And Cash Equivalents [Table Text Block]

	2018		2017		2016		2015
Cash and cash equivalents	$	104,147	$	89,879	$	88,818	$	81,053
Restricted cash included in other assets		20,278		21,171		21,883		22,874
Cash, cash equivalents and restricted cash	$	124,425	$	111,050	$	110,701	$	103,927

AR and Allowance for Doubtful Accounts (Tables)

12 Months Ended

Dec. 31, 2018

Accounts Receivable and Allowance for Doubtful Accounts [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

							Exchange Rate
	Balance at		Changes		Write-Offs		Changes		Balance
	Beginning		to Costs and		Charged to		and Other		at End
	of Period		Expenses		Allowance		Adjustments		of Period
Allowance for Doubtful Accounts
Year ended December 31, 2018	$	5,457	$	493	$	(295)	$	(468)	$	5,187
Year ended December 31, 2017	$	7,220	$	137	$	(2,206)	$	306	$	5,457
Year ended December 31, 2016	$	7,818	$	1,375	$	(1,949)	$	(24)	$	7,220

Inventories (Tables)

12 Months Ended

Dec. 31, 2018

Inventories [Abstract]

Schedule of Inventory, Current [Table Text Block]

		2018		2017
Raw materials and supplies	$	48,134	$	44,439
Work in process, finished goods and reserves		45,956		42,782
Total inventories, net	$	94,090	$	87,221

Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment [Table Text Block]

		2018		2017
Land	$	10,170	$	10,635
Building and improvements		84,980		87,111
Machinery and equipment		151,180		153,312
Construction in progress		7,907		4,932
Property, Plant and Equipment, at cost		254,237		255,990
Less accumulated depreciation		(170,314)		(169,286)
Total Property, Plant and Equipment, net	$	83,923	$	86,704

Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]

		North						South
		America		EMEA		Asia/Pacific		America		Total
Balance as of December 31, 2016		$	45,490	$	18,189	$	14,566	$	2,559	$	80,804
	Goodwill additions		1,832		—		—		—		1,832
	Currency translation adjustments		249		2,315		890		(56)		3,398
Balance as of December 31, 2017			47,571		20,504		15,456		2,503		86,034
	Currency translation adjustments		(268)		(1,169)		(869)		(395)		(2,701)
Balance as of December 31, 2018		$	47,303	$	19,335	$	14,587	$	2,108	$	83,333

Schedule of Finite-Lived Intangible Assets [Table Text Block]

	Gross Carrying				Accumulated
	Amount				Amortization
	2018		2017		2018		2017
Customer lists and rights to sell	$	74,989	$	76,581	$	29,587	$	25,394
Trademarks, formulations and product technology		33,275		33,025		16,469		14,309
Other		5,840		6,114		5,566		5,514
Total definite-lived intangible assets	$	114,104	$	115,720	$	51,622	$	45,217

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

For the year ended December 31, 2019	$	7,160
For the year ended December 31, 2020		6,879
For the year ended December 31, 2021		6,529
For the year ended December 31, 2022		6,374
For the year ended December 31, 2023		6,155

Investment in Associated Companies (Tables)

12 Months Ended

Dec. 31, 2018

Investments in Associated Companies [Abstract]

Schedule of Equity Method Investments [Table Text Block]

		As of December 31,
		2018		2017
Current assets	$	43,581	$	37,683
Noncurrent assets		990		936
Current liabilities		29,632		24,858
Noncurrent liabilities		1,685		1,457

		Year Ended December 31,
		2018		2017		2016
Net sales	$	43,875	$	42,555	$	41,448
Gross margin		12,983		13,440		13,082
Income before income taxes		2,494		2,900		2,289
Net income		1,874		1,471		1,210

		As of December 31,
		2018		2017
Total assets	$	103,705	$	120,154
Total liabilities		53,049		54,258

		Year Ended December 31,
		2018		2017		2016
Revenue	$	5,841	$	14,042	$	5,632
Income before income taxes		3,688		11,705		5,622
Net income		2,954		7,788		5,148

Other Assets (Tables)

12 Months Ended

Dec. 31, 2018

Other Assets [Abstract]

Schedule of Other Assets, Noncurrent [Table Text Block]

	2018		2017
Restricted insurance settlement	$	20,278	$	21,171
Uncertain tax positions		4,861		4,543
Supplemental retirement income program		1,491		1,594
Pension assets		3,656		1,184
Other		1,769		1,557
Total other assets	$	32,055	$	30,049

Other Current Liabilities (Tables)

12 Months Ended

Dec. 31, 2018

Other Current Liabilities [Abstract]

Schedule of Accrued Liabilities [Table Text Block]

		2018		2017
Non-income taxes	$	8,462	$	9,196
Accrued interest		4,340		884
Professional fees		3,831		5,019
Selling expenses		3,582		2,846
Freight		2,188		1,780
Customer advances and sales return reserves		2,187		1,507
Current income taxes payable		1,358		841
Legal		1,067		1,169
Accrued rent and facilities		763		775
Other		3,330		3,304
Total other current liabilities	$	31,108	$	27,321

Debt (Tables)

12 Months Ended

Dec. 31, 2018

Debt [Abstract]

Schedule of Debt [Table Text Block]

		2018		2017
Credit facilities	$	24,034	$	48,514
Industrial development bonds		10,000		15,000
Municipality-related loans		2,549		3,290
Other debt obligations (including capital leases)		21		—
Total debt		36,604		66,804
Current portion of long-term debt		(670)		(5,736)
Long-term debt	$	35,934	$	61,068

Schedule of Maturities of Long-term Debt [Table Text Block]

2019	$	670
2020		24,730
2021		398
2022		270
2023		240

Pension and Other Post Retirement Benefits (Tables)

12 Months Ended

Dec. 31, 2018

Pension and Other Postretirement Benefits [Abstract]

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

																Other Post-
				Pension Benefits												Retirement Benefits
				2018							2017					2018		2017
Change in benefit obligation				Foreign		U.S.		Total		Foreign		U.S.		Total		U.S.		U.S.
Gross benefit obligation at beginning
	of year			$	118,352	$	62,977	$	181,329	$	103,491	$	67,254	$	170,745	$	4,729	$	4,730
Service cost					3,426		383		3,809		3,219		337		3,556		7		8
Interest cost					2,254		1,847		4,101		2,066		1,932		3,998		130		144
Employee contributions					73		—		73		68		—		68		—		—
Plan settlements					(10)		—		(10)		—		(4,341)		(4,341)		—		—
Benefits paid					(1,639)		(4,330)		(5,969)		(2,503)		(4,031)		(6,534)		(317)		(448)
Plan expenses and premiums paid					(161)		—		(161)		(210)		—		(210)		—		—
Actuarial (gain) loss					(5,561)		(2,143)		(7,704)		(1,164)		1,826		662		(443)		295
Translation differences and other					(5,418)		—		(5,418)		13,385		—		13,385		—		—
Gross benefit obligation at end of year				$	111,316	$	58,734	$	170,050	$	118,352	$	62,977	$	181,329	$	4,106	$	4,729
Change in plan assets
Fair value of plan assets at
year	beginning of year			$	98,622	$	51,964	$	150,586	$	86,844	$	49,197	$	136,041	$	—	$	—
Actual return on plan assets					(2,670)		457		(2,213)		116		6,865		6,981		—		—
Employer contributions					5,269		1,574		6,843		2,867		4,574		7,441		317		448
Employee contributions					73		—		73		68		—		68		—		—
Plan settlements					(10)		—		(10)		—		(4,341)		(4,341)		—		—
Benefits paid					(1,639)		(4,330)		(5,969)		(2,503)		(4,031)		(6,534)		(317)		(448)
Plan expenses and premiums paid					(161)		(250)		(411)		(210)		(300)		(510)		—		—
Translation differences					(4,658)		—		(4,658)		11,440		—		11,440		—		—
Fair value of plan assets at end of year				$	94,826	$	49,415	$	144,241	$	98,622	$	51,964	$	150,586	$	—	$	—
Net benefit obligation recognized				$	(16,490)	$	(9,319)	$	(25,809)	$	(19,730)	$	(11,013)	$	(30,743)	$	(4,106)	$	(4,729)
Amounts recognized in the balance
	sheet consist of:
		Non-current assets		$	—	$	3,656	$	3,656	$	—	$	1,184	$	1,184	$	—	$	—
		Current liabilities			(206)		(559)		(765)		(89)		(560)		(649)		(446)		(459)
		Non-current liabilities			(16,284)		(12,416)		(28,700)		(19,641)		(11,637)		(31,278)		(3,660)		(4,270)
Net benefit obligation recognized				$	(16,490)	$	(9,319)	$	(25,809)	$	(19,730)	$	(11,013)	$	(30,743)	$	(4,106)	$	(4,729)
Amounts not yet reflected in net
	periodic benefit costs and included in
	accumulated other comprehensive loss:
		Prior service credit (cost)		$	1,497	$	—	$	1,497	$	1,744	$	(59)	$	1,685	$	—	$	—
		Accumulated loss			(20,089)		(25,310)		(45,399)		(22,598)		(27,133)		(49,731)		(338)		(823)

		AOCI			(18,592)		(25,310)		(43,902)		(20,854)		(27,192)		(48,046)		(338)		(823)
		Cumulative employer contributions
			in excess of or (below) net periodic
			benefit cost		2,102		15,991		18,093		1,124		16,179		17,303		(3,768)		(3,906)
Net benefit obligation recognized				$	(16,490)	$	(9,319)	$	(25,809)	$	(19,730)	$	(11,013)	$	(30,743)	$	(4,106)	$	(4,729)

Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]

	2018							2017
	Foreign		U.S.		Total		Foreign		U.S.		Total
Projected benefit obligation	$	111,316	$	12,975	$	124,291	$	118,352	$	12,197	$	130,549
Accumulated benefit obligation		107,685		11,808		119,493		114,069		11,456		125,525
Fair value of plan assets		94,826		—		94,826		98,622		—		98,622

Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]

	2018							2017
	Foreign		U.S.		Total		Foreign		U.S.		Total
Projected benefit obligation	$	111,316	$	12,975	$	124,291	$	118,352	$	12,197	$	130,549
Fair value of plan assets		94,826		—		94,826		98,622		—		98,622

Schedule of Net Benefit Costs [Table Text Block]

	2018							2017
	Foreign		U.S.		Total		Foreign		U.S.		Total
Service cost	$	3,426	$	383	$	3,809	$	3,219	$	337	$	3,556
Interest cost		2,254		1,847		4,101		2,066		1,932		3,998
Expected return on plan assets		(2,228)		(2,803)		(5,031)		(1,994)		(3,067)		(5,061)
Settlement loss		2		—		2		—		1,946		1,946
Actuarial loss amortization		881		2,276		3,157		862		2,396		3,258
Prior service (credit) cost
amortization		(175)		59		(116)		(167)		63		(104)
Net periodic benefit cost	$	4,160	$	1,762	$	5,922	$	3,986	$	3,607	$	7,593

		2016
	Foreign		U.S.		Total
Service cost	$	2,378	$	298	$	2,676
Interest cost		2,314		2,114		4,428
Expected return on plan assets		(2,026)		(3,316)		(5,342)
Actuarial loss amortization		839		2,336		3,175
Prior service (credit) cost amortization		(164)		63		(101)
Net periodic benefit cost	$	3,341	$	1,495	$	4,836

		2018		2017		2016
Service cost	$	7	$	8	$	10
Interest cost		130		144		142
Actuarial loss amortization		42		54		—
Net periodic benefit costs	$	179	$	206	$	152

Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

			2018							2017
			Foreign		U.S.		Total		Foreign		U.S.		Total
Net (gain) loss arising during
	the period		$	(663)	$	453	$	(210)	$	715	$	(1,672)	$	(957)
Recognition of amortization in net
	periodic benefit cost
		Prior service credit (cost)		175		(59)		116		167		(63)		104
		Actuarial loss		(883)		(2,276)		(3,159)		(862)		(4,342)		(5,204)
Effect of exchange rates on amounts
		included in AOCI		(890)		—		(890)		2,308		—		2,308
Total recognized in other
		comprehensive (income) loss		(2,261)		(1,882)		(4,143)		2,328		(6,077)		(3,749)
Total recognized in net periodic
	benefit cost and other
	comprehensive loss (income)		$	1,899	$	(120)	$	1,779	$	6,314	$	(2,470)	$	3,844

			2016
				Foreign		U.S.		Total
Net gain arising during period			$	2,401	$	3,576	$	5,977
Recognition of amortization in net periodic benefit
		Prior service credit (cost)		164		(63)		101
		Actuarial loss		(839)		(2,336)		(3,175)
Effect of exchange rates on amounts included
	in AOCI			(1,347)		—		(1,347)

Total recognized in other comprehensive loss				379		1,177		1,556
Total recognized in net periodic benefit cost and
	other comprehensive loss		$	3,720	$	2,672	$	6,392

			2018		2017		2016
Net (gain) loss arising during period		$	(443)	$	295	$	(401)
Amortization of actuarial loss in net periodic
	benefit costs		(42)		(54)		—
Total recognized in other comprehensive (income)
	loss		(485)		241		(401)
Total recognized in net periodic benefit cost and
	other comprehensive (income) loss	$	(306)	$	447	$	(249)

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]

							Other Post-
	Pension Plans						Retirement
	Foreign		U.S.		Total		Benefits
Actuarial loss	$	769	$	2,330	$	3,099	$	—
Prior service credit		(169)		—		(169)		—
	$	600	$	2,330	$	2,930	$	—

Schedule of Assumptions Used [Table Text Block]

					Other Postretirement
	Pension Benefits				Benefits
	2018		2017		2018		2017
U.S. Plans:
Discount rate	4.07	%	3.44	%	4.03	%	3.39	%
Rate of compensation increase	3.63	%	3.63	%	N/A		N/A

Foreign Plans:
Discount rate	2.47	%	2.31	%	N/A		N/A
Rate of compensation increase	2.89	%	2.89	%	N/A		N/A

						Other Postretirement
		Pension Benefits				Benefits
		2018		2017		2018		2017
U.S. Plans:
Discount rate		3.44	%	3.88	%	3.39	%	3.73	%
Expected long-term return on
	plan assets	5.95	%	7.00	%	N/A		N/A
Rate of compensation increase		3.63	%	3.63	%	N/A		N/A

Foreign Plans:
Discount rate		2.33	%	2.17	%	N/A		N/A
Expected long-term return on
	plan assets	2.22	%	2.12	%	N/A		N/A
Rate of compensation increase		2.89	%	2.48	%	N/A		N/A

		2018		2017
Health care cost trend rate for next year		6.20	%	6.40	%
Rate to which the cost trend rate is assumed to decline (the
	ultimate trend rate)	4.50	%	4.50	%
Year that the rate reaches the ultimate trend rate		2037		2037

Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]

		1% Point		1% Point
		Increase		Decrease
Effect on total service and interest cost	$	11	$	(9)
Effect on postretirement benefit obligations		299		(311)

Schedule of Allocation of Plan Assets [Table Text Block]

Asset Category		Target		2018		2017
U.S. Plans
Equity securities		10	%	9	%	59	%
Debt securities		89	%	90	%	40	%
Other		1	%	1	%	1	%
	Total	100	%	100	%	100	%

Foreign Plans
Equity securities and other		24	%	24	%	25	%
Debt securities		76	%	76	%	75	%
	Total	100	%	100	%	100	%

						Fair Value Measurements at December 31, 2018
				Total			Using Fair Value Hierarchy
U.S. Pension Assets				Fair Value			Level 1		Level 2		Level 3
Cash and cash equivalents				$	450		$	450	$	—	$	—
	Subtotal U.S. pension plan assets in fair value hierarchy			$	450		$	450	$	—	$	—
Commingled funds measured at NAV					48,965
		Total U.S. pension plan assets		$	49,415

Foreign Pension Assets
Cash and cash equivalents				$	209		$	209	$	—	$	—
Insurance contract					79,873			—		—		79,873
Diversified equity securities - registered investment companies					7,701			—		7,701		—
Fixed income - foreign registered investment companies					2,658			—		2,658		—
Real estate - registered investment companies					2,382			—		—		2,382
	Sub-total of foreign pension assets in fair value hierarchy			$	92,823		$	209	$	10,359	$	82,255
Commingled funds measured at NAV					2,003
		Total foreign pension assets		$	94,826

			Total pension assets in fair value hierarchy	$	93,273		$	659	$	10,359	$	82,255
			Total pension assets measured at NAV		50,968
			Total pension assets	$	144,241

						Fair Value Measurements at December 31, 2017
				Total			Using Fair Value Hierarchy
U.S. Pension Assets				Fair Value			Level 1		Level 2		Level 3
Cash and cash equivalents				$	449		$	449	$	—	$	—
Small capitalization common stock					1,508			1,508		—		—
	Subtotal U.S. pension plan assets in fair value hierarchy			$	1,957		$	1,957	$	—	$	—
Commingled funds measured at NAV					48,527
Pooled separate accounts measured at NAV					1,480
		Total U.S. pension plan assets		$	51,964

Foreign Pension Assets
Cash and cash equivalents				$	26		$	26	$	—	$	—
Insurance contract					82,092			—		—		82,092
Diversified equity securities - registered investment companies					9,002			—		9,002		—
Fixed income - foreign registered investment companies					2,951			—		2,951		—
Real estate - registered investment companies					2,428			—		—		2,428
	Subtotal foreign pension assets in fair value hierarchy			$	96,499		$	26	$	11,953	$	84,520
Commingled funds measured at NAV					2,123
		Total foreign pension plan assets		$	98,622

			Total pension assets in fair value hierarchy	$	98,456		$	1,983	$	11,953	$	84,520
			Total pension assets measured at NAV		52,130
			Total pension assets	$	150,586

Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]

			Insurance		Real Estate
			Contract		Fund		Total
Balance as of December 31, 2016		$	72,778	$	2,041	$	74,819
	Purchases		2,350		—		2,350
	Settlements		(1,661)		—		(1,661)
	Unrealized (losses) gains		(1,425)		188		(1,237)
	Currency translation adjustment		10,050		199		10,249
Balance as of December 31, 2017			82,092		2,428		84,520
	Purchases		4,707		—		4,707
	Settlements		(1,399)		—		(1,399)
	Unrealized (losses) gains		(1,817)		94		(1,723)
	Currency translation adjustment		(3,710)		(140)		(3,850)
Balance as of December 31, 2018		$	79,873	$	2,382	$	82,255

Schedule of Expected Benefit Payments [Table Text Block]

							Other Post-
	Pension Benefits						Retirement
	Foreign		U.S.		Total		Benefits
2019	$	2,240	$	4,515	$	6,755	$	446
2020		2,443		4,286		6,729		422
2021		3,166		4,220		7,386		393
2022		3,124		4,237		7,361		367
2023		3,336		4,860		8,196		349
2024 to 2028		19,212		22,107		41,319		1,380

Other Non-Current Liabilities (Tables)

12 Months Ended

Dec. 31, 2018

Other Liabilities Noncurrent [Abstract]

Schedule of Other Assets and Other Liabilities [Table Text Block]

	2018		2017
Restricted insurance settlement	$	20,278	$	21,171
Non-current income taxes payable		7,644		15,825
Uncertain tax positions (includes interest and penalties)		8,097		7,970
Deferred and other long-term compensation		6,886		5,905
Other		624		625
Total other non-current liabilities	$	43,529	$	51,496

Equity and Noncontrolling Interest (Tables)

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

						Unrealized Gain (Loss) in
				Defined		Unrealized Gain (Loss) in
		Currency		Benefit		Available-for-
		Translation		Pension		Sale
		Adjustments		Plans		Securities		Total
Balance as of December 31, 2015		$	(38,544)	$	(35,251)	$	479	$	(73,316)
	Other comprehensive (loss) income before reclassifications		(13,711)		(4,229)		834		(17,106)
	Amounts reclassified from AOCI		—		3,075		(17)		3,058
	Related tax amounts		—		237		(280)		(43)
Balance as of December 31, 2016			(52,255)		(36,168)		1,016		(87,407)
	Other comprehensive income (loss) before reclassifications		20,362		(1,646)		2,299		21,015
	Amounts reclassified from AOCI		—		5,154		(2,494)		2,660
	Related tax amounts		—		(1,433)		65		(1,368)
Balance as of December 31, 2017			(31,893)		(34,093)		886		(65,100)
	Other comprehensive (loss) income before reclassifications		(17,429)		1,543		(2,622)		(18,508)
	Amounts reclassified from AOCI		—		3,085		435		3,520
	Related tax amounts		—		(1,086)		459		(627)
Balance as of December 31, 2018		$	(49,322)	$	(30,551)	$	(842)	$	(80,715)

Fair Value Measurements (Table)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

			Fair Value Measurements at December 31, 2018
	Total			Using Fair Value Hierarchy
Assets	Fair Value			Level 1		Level 2		Level 3
Company-owned life insurance	$	1,491		$	—	$	1,491	$	—
Total	$	1,491		$	—	$	1,491	$	—

			Fair Value Measurements at December 31, 2017
	Total			Using Fair Value Hierarchy
Assets	Fair Value			Level 1		Level 2		Level 3
Company-owned life insurance	$	1,594		$	—	$	1,594	$	—
Total	$	1,594		$	—	$	1,594	$	—

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of Operating Lease Maturities [Table Text Block]

2019	$	7,068
2020		5,635
2021		4,509
2022		3,523
2023		2,659
2024 and beyond		7,779

Quarterly Results - Unaudited (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Results (unaudited) [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]

			First		Second		Third		Fourth
			Quarter (1)		Quarter (2)		Quarter (3)		Quarter (4)
2018
	Net sales		$	212,055	$	221,962	$	222,022	$	211,481
	Gross profit			75,447		80,937		81,093		74,838
	Operating income			20,231		22,563		24,919		20,068
	Net income attributable to Quaker Chemical Corporation			12,732		19,246		19,690		7,805
	Net income attributable to Quaker Chemical Corporation
		Common Shareholders - Basic (5)	$	0.96	$	1.44	$	1.48	$	0.59
	Net income attributable to Quaker Chemical Corporation
		Common Shareholders - Diluted (5)	$	0.95	$	1.44	$	1.47	$	0.58

2017
	Net sales		$	194,909	$	201,183	$	212,918	$	211,072
	Gross profit			70,887		71,835		74,776		73,997
	Operating income			13,758		17,903		14,009		17,074
	Net income (loss) attributable to Quaker Chemical Corporation			6,992		11,906		11,142		(9,762)
	Net income (loss) attributable to Quaker Chemical Corporation
		Common Shareholders - Basic (5)	$	0.53	$	0.90	$	0.84	$	(0.73)
	Net income (loss) attributable to Quaker Chemical Corporation
		Common Shareholders - Diluted (5)	$	0.52	$	0.89	$	0.83	$	(0.73)

Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Significant Accounting Policies [Abstract]
Research and Development Expense	$ 24.5	$ 23.9	$ 22.5
Measurement of Tax Benefit, Minimum Likelihood of the Largest Amount Being Realized Upon Ultimate Settlement	50.00%

Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Capitalized Computer Software, Net	$ 1.1	$ 1.3
Building and Building Improvements [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	45 years
Building and Building Improvements [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Machinery and Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	15 years
Machinery and Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	1 year
Software Development [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Software Development [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years

Significant Accounting Policies - Intangible Assets (Details)	12 Months Ended
	Dec. 31, 2018
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	4 years

Significant Accounting Policies - Concentration Risk (Details)	12 Months Ended
	Dec. 31, 2018
Top Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	8.00%

Significant Accounting Policies - Share-Based Compensation (Details)	12 Months Ended
	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity Award Vesting Period	3 years
Forfeiture rate, Nonvested Stock Awards	13.00%
Employee Stock Option [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity Award Vesting Period	3 years
Options, Maximum Exercisable Life	7 years
Employee Stock Option [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity Award Vesting Period	1 year
Restricted Stock [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity Award Vesting Period	4 years
Restricted Stock [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity Award Vesting Period	1 year
GAIP Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity Award Vesting Period	5 years
GAIP Plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity Award Vesting Period	2 years
Restricted Stock Units (RSUs) [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity Award Vesting Period	4 years
Restricted Stock Units (RSUs) [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity Award Vesting Period	1 year

Siginficant Accounting Policies - Hyperinflationary accounting (Details)	12 Months Ended
	Dec. 31, 2018
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts [Line Items]
Currency Conversion Impacts Of HyperInflationary Accounting	During the years ended December 31, 2018, 2017 and 2016, the Company recorded $0.7 million, $0.4 million, and $0.1 million, respectively, of hyper-inflationary accounting remeasurement losses associated with the applicable currency conversions related to Venezuela and Argentina.
Inflationary Percentage	100.00%
Argentina Assets Total [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	1.00%
Argentina Sales Revenue Net [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	1.00%

Houghton Combination (Details) - USD ($) $ in Millions	12 Months Ended
Houghton Combination (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Combination Separately Recognized Transactions [Abstract]
Business Combination Separately Recognized Transactions Description	In April 2017, Quaker entered into a share purchase agreement with Gulf Houghton Lubricants, Ltd. to purchase the entire issued and outstanding share capital of Houghton International, Inc. (“Houghton”) (herein referred to as “the Combination”). The shares will be bought for aggregate purchase consideration consisting of: (i) $172.5 million in cash; (ii) a number of shares of common stock, $1.00 par value per share, of the Company comprising 24.5% of the common stock outstanding upon the closing of the Combination; and (iii) the Company’s assumption of Houghton’s net indebtedness as of the closing of the Combination, which was approximately $690 million at signing. At closing, the total aggregate purchase consideration is dependent on the Company’s stock price and the level of Houghton’s indebtedness. The Company secured $1.15 billion in commitments from Bank of America Merrill Lynch and Deutsche Bank to fund the Combination and to provide additional liquidity, and has since replaced these commitments with a syndicated bank agreement (“the New Credit Facility”) with a group of lenders for $1.15 billion. The New Credit Facility is contingent upon and will not be effective until the closing of the Combination. During the fourth quarter of 2018, the Company extended the bank commitment for the New Credit Facility through March 15, 2019. The New Credit Facility is comprised of a $400.0 million multicurrency revolver, a $600.0 million USD term loan and a $150.0 million EUR equivalent term loan, each with a five-year term from the date the New Credit Facility becomes effective. The maximum amount available under the New Credit Facility can be increased by $200.0 million at the Company’s option if the lenders agree and the Company satisfies certain conditions. Borrowings under the New Credit Facility will bear interest at a base rate, LIBOR rate plus a margin, or Euribor rate plus a margin. The Company currently estimates the annual floating rate cost will be in the 3.75% to 4.0% range based on current market interest rates. The New Credit Facility will be subject to certain financial and other covenants, including covenants that the Company’s consolidated net debt to adjusted EBITDA ratio cannot exceed 4.25 to 1 and the Company’s consolidated adjusted EBITDA to interest expense ratio cannot be less than 3.0 to 1. Both the USD and EUR equivalent term loans will have quarterly principal amortization during their respective five-year terms, with 5.0% amortization of the principal balance due in years 1 and 2, 7.5% in year 3, and 10.0% in years 4 and 5, with the remaining principal amounts due at maturity. Until closing, the Company will incur certain interest costs paid to maintain the bank commitment (“ticking fees”), which began to accrue on September 29, 2017 and bear an interest rate of 0.30% per annum. The Company received regulatory approval for the Combination from China and Australia in 2017. In addition, at a shareholder meeting held during 2017, the Company’s shareholders overwhelmingly approved the issuance of the new shares of the Company’s common stock at closing of the Combination. The European Commission (“EC”) conditionally approved the Combination in December 2018, including the remedy proposed by Quaker and Houghton. The Company expects final approval from the EC once the final purchase agreement is in place between Quaker, Houghton, and the buyer of the divested product lines. The Company continues to be in productive discussions with the U.S. Federal Trade Commission (“FTC”), although the process is taking longer than anticipated. Given the time lapse since the Company’s initial filing, the FTC requested updated information as part of their approval process late in the fourth quarter of 2018. In addition, the government shutdown in the U.S. during the first quarter of 2019 extended the timeline to receive the final approval. Given current information, the Company estimates that FTC and EC final approval and closing of the combination will occur within the next few months.
Business Combination Separately Recognized Transactions Additional Disclosures Acquisition Cost Expensed	$ 19.5	$ 30.8	$ 1.5
Business Combination Separately Recognized Transactions Liabilities Recognized	$ 8.2	$ 5.5

Recently Issued Accounting Standards - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
New Accounting Pronouncement Or Change In Accounting Principle Description	Adoption of the revenue recognition guidance did not have a material impact on the Company’s reported earnings or cash flows, however, adoption did increase the amount and level of disclosures concerning the Company’s net sales and did result in one adjustment to the Company’s balance sheet. As a result of the Company’s impact assessment and adoption using the modified retrospective adoption approach, the Company recorded a cumulative effect of an accounting change as of January 1, 2018 to adjust the Company’s estimate of variable consideration relating to customers’ expected rights to return product. This adjustment resulted in an increase to other current liabilities of $1.0 million, an increase to non-current deferred tax assets of $0.2 million and a decrease to retained earnings of $0.8 million. There were no other impacts recorded as a result of adopting the revenue recognition guidance in 2018 or prior years and the Company expects the impact to be immaterial on an ongoing basis.
Accounting Standards Update 201602 [Member] \| Right Of Use Lease Assets And Liabilities [Member] \| Maximum [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
New Accounting Pronouncement Or Change In Accounting Principle Effect Of Adoption Quantification	$ 30
Accounting Standards Update 201602 [Member] \| Right Of Use Lease Assets And Liabilities [Member] \| Minimum [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
New Accounting Pronouncement Or Change In Accounting Principle Effect Of Adoption Quantification	$ 20

- Definition

Disclosure related to a new accounting pronouncement or a change in accounting principle, including the nature and reason for the change and the effect of the change on prior periods and the current period.

+ References + Details

Net Sales and Revenue Recognition - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues [Abstract]
Net Reporting Amount	$ 47.1	$ 44.5	$ 43.5
Deferred Revenue	$ 1.3	$ 1.5
Top Five Customers Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	17.00%
Top Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	8.00%

Revenue- Product Lines (Details) - Sales Revenue Net [Member]	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	1.00%
Rolling Lubricants Product Line [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	16.90%	17.80%	19.00%
Machining And Grinding Compounds Product Line [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	16.10%	15.80%	14.90%
Hydraulic Fluids Product Line [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	11.40%	11.60%	12.00%
Corrosion Preventives Product Line [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	11.60%	11.40%	11.80%
Specialty Greases [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	9.70%	10.00%	10.10%

Segments Table (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
Segments Table (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net Sales	$ 211,481	$ 222,022	$ 221,962	$ 212,055	$ 211,072	$ 212,918	$ 201,183	$ 194,909	$ 867,520	$ 820,082	$ 746,665
Operating income for reportable segments	184,183				165,313				184,183	165,313	158,895
Segment assets	709,665				722,126				709,665	722,126	692,028
Long-Lived Assets	137,294				142,443				137,294	142,443	137,303
Capital Expenditures									12,886	10,872	9,954
Depreciation									12,196	12,477	12,432
Non Domestic [Member]
Segment Reporting Information [Line Items]
Net Sales									50,800	49,200	35,800
Long-Lived Assets	4,500				4,900				4,500	4,900	4,900
North America [Member]
Segment Reporting Information [Line Items]
Net Sales									383,471	356,598	336,174
Operating income for reportable segments	88,276				77,694				88,276	77,694	77,833
Segment assets	317,934				324,260				317,934	324,260	321,404
Long-Lived Assets	84,876				88,818				84,876	88,818	86,775
Capital Expenditures									4,574	3,919	2,918
Depreciation									5,770	5,791	5,672
EMEA [Member]
Segment Reporting Information [Line Items]
Net Sales									233,597	226,243	200,917
Operating income for reportable segments	35,970				35,350				35,970	35,350	33,810
Segment assets	157,111				177,267				157,111	177,267	147,021
Long-Lived Assets	26,239				28,507				26,239	28,507	25,630
Capital Expenditures									2,081	3,936	3,263
Depreciation									3,434	3,368	3,323
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net Sales									214,157	201,008	179,131
Operating income for reportable segments	56,056				48,342				56,056	48,342	45,866
Segment assets	212,545				196,891				212,545	196,891	200,218
Long-Lived Assets	23,650				22,427				23,650	22,427	22,040
Capital Expenditures									6,059	2,458	3,269
Depreciation									2,552	2,669	2,765
South America [Member]
Segment Reporting Information [Line Items]
Net Sales									36,295	36,233	30,443
Operating income for reportable segments	3,881				3,927				3,881	3,927	1,386
Segment assets	22,075				23,708				22,075	23,708	23,385
Long-Lived Assets	$ 2,529				$ 2,691				2,529	2,691	2,858
Capital Expenditures									172	559	504
Depreciation									440	649	672
Intersegment Sales Elimination [Member] \| North America [Member]
Segment Reporting Information [Line Items]
Net Sales									9,700	9,400	8,300
Intersegment Sales Elimination [Member] \| EMEA [Member]
Segment Reporting Information [Line Items]
Net Sales									22,000	22,000	18,100
Intersegment Sales Elimination [Member] \| Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net Sales									500	400	700
Intersegment Sales Elimination [Member] \| South America [Member]
Segment Reporting Information [Line Items]
Net Sales									$ 100	$ 100	$ 100

Segments Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
Segments Reconciliation (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation From Segment Totals To Consolidated Abstract
Operating income for reportable segments	$ 184,183				$ 165,313				$ 184,183	$ 165,313	$ 158,895
Non-operating Charges									(72,223)	(65,142)	(65,316)
Restructuring and related activities									0	0	439
Combination-related expenses									(16,661)	(29,938)	(1,531)
Depreciation of corporate assets and amortization									(7,518)	(7,489)	(7,134)
Operating income	$ 20,068	$ 24,919	$ 22,563	$ 20,231	$ 17,074	$ 14,009	$ 17,903	$ 13,758	87,781	62,744	85,353
Interest expense									(6,158)	(3,892)	(2,889)
Interest income									2,117	2,534	2,037
Other expense, net									(642)	(718)	(492)
Income before taxes and equity in net income of associated companies									$ 83,098	$ 60,668	$ 84,009

Restructuring Activities - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring And Related Activities [Abstract]
Restructuring and related activities	$ 0	$ 0	$ (439)
Restructuring And Related Cost Description	The 2015 Program included provisions for the reduction of total headcount by approximately 65 employees globally. The Company substantially completed all of the initiatives under the 2015 Program in 2016 and settlement of these charges occurred primarily in 2016 as well. During the fourth quarter of 2016, the Company recognized a restructuring credit of $0.4 million in connection with the 2015 Program, due to customary and routine adjustments to initial estimates for employee separation costs.

Restructuring Activities (Details) - USD ($) $ in Thousands	12 Months Ended
Restructuring Activities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Reserve [Roll Forward]
Accrued Restructuring, Beginning Balance	$ 0	$ 670	$ 6,303
Restructuring and related activities	0	0	(439)
Cash Payments		(675)	(5,252)
Currency Translation Adjustments		5	58
Accrued Restructuring, Ending Balance		0	670
North America [Member]
Restructuring Reserve [Roll Forward]
Accrued Restructuring, Beginning Balance	0	196	1,867
Restructuring and related activities		(126)	0
Cash Payments		(70)	(1,671)
Currency Translation Adjustments		0	0
Accrued Restructuring, Ending Balance		0	196
EMEA [Member]
Restructuring Reserve [Roll Forward]
Accrued Restructuring, Beginning Balance	0	474	4,265
Restructuring and related activities		126	(439)
Cash Payments		(605)	(3,404)
Currency Translation Adjustments		5	52
Accrued Restructuring, Ending Balance		0	474
Asia Pacific [Member]
Restructuring Reserve [Roll Forward]
Accrued Restructuring, Beginning Balance	0	0	135
Restructuring and related activities		0	0
Cash Payments		0	(138)
Currency Translation Adjustments		0	3
Accrued Restructuring, Ending Balance		0	0
South America [Member]
Restructuring Reserve [Roll Forward]
Accrued Restructuring, Beginning Balance	$ 0	0	36
Restructuring and related activities		0	0
Cash Payments		0	(39)
Currency Translation Adjustments		0	3
Accrued Restructuring, Ending Balance		$ 0	$ 0

Share-Based Compensation - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation [Abstract]
Exercised Options, Intrinsic Value	$ 2.0	$ 3.4	$ 2.9
Equity Award Vesting Period	3 years
Share Based Compensation [Line Items]
ESPP: Purchase Price Percentage	85.00%
ESPP: Discount from Market Price	15.00%
ESPP: Maximum Ownership of Outstanding Shares	An employee whose stock ownership of the Company exceeds five percent of the outstanding common stock is not eligible to participate in this plan.
Director Stock Ownership Plan Maximum Number of Shares Authorized Under Plan	75,000
Director Stock Ownership Plan Terms	Under the Plan, each director who, on May 1 of the applicable calendar year, owns less than 400% of the annual cash retainer for the applicable calendar year, divided by the average of the closing price of a share of Quaker Common Stock as reported by the composite tape of the New York Stock Exchange for the previous calendar year (the “Threshold Amount”), is required to receive 75% of the annual cash retainer in Quaker common stock and 25% of the retainer in cash, unless the director elects to receive a greater percentage of Quaker common stock, up to 100% of the annual cash retainer for the applicable year. Each director who owns more than the Threshold Amount may elect to receive common stock in payment of a percentage (up to 100%) of the annual cash retainer.
Director Retainer Annual Fee	$ 0.1
Employee Stock Option [Member]
Share Based Compensation [Line Items]
Weighted Average Remaining Life, Nonvested Stock Awards	1 year 10 months
Restricted Stock [Member]
Share Based Compensation [Line Items]
Unrecognized Share-based Compensation Expense, Nonvested Stock Award	$ 2.1
Weighted Average Remaining Life, Nonvested Stock Awards	1 year 9 months
Restricted Stock Units (RSUs) [Member]
Share Based Compensation [Line Items]
Unrecognized Share-based Compensation Expense, Nonvested Stock Award	$ 0.2
Weighted Average Remaining Life, Nonvested Stock Awards	1 year 10 months

Share-Based Compensation - Expense Table (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based Compensation Expense	$ 3,724	$ 4,190	$ 6,349
Stock Options Compensation Expense [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based Compensation Expense	1,053	958	848
Nonvested Stock Awards Compensation Expense [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based Compensation Expense	2,459	2,935	3,121
Employee Stock Purchase Plan Compensation Expense [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based Compensation Expense	89	88	87
Matching Stock Contribution 401 K Plan Compensation Expense [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based Compensation Expense	0	72	2,124
Directors Stock Ownership Plan Compensation Expense [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based Compensation Expense	$ 123	$ 137	$ 169

Share-Based Compensation - Excess Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Excess tax benefit from stock option exercises	$ 0	$ 0	$ 678

Share-Based Compensation - Option Rollforward (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Roll [Forward]
Beginning Balance \| shares	111,255
Options Granted \| shares	35,842
Options Exercised \| shares	(25,025)
Ending Balance \| shares	122,072
Options Expected to Vest \| shares	86,635
Options Exerciseable \| shares	35,437
Weighted Average Exercise Price [Abstract]
Outstanding at beginning of year \| $ / shares	$ 97.71
Options Granted \| $ / shares	151.75
Options Exercised \| $ / shares	83.96
Outstanding at End of Period \| $ / shares	116.39
Options Expected to Vest \| $ / shares	125.48
Options Exerciseable \| $ / shares	$ 94.17
Share Based Compensation Arrangement By Share Based Payment Award Options Additional Disclosures [Abstract]
Weighted Average Remaining Contractual Term, Outstanding	5 years
Weighted Average Remaining Contractual Term, Expected to Vest	5 years 4 months
Weighted Average Remaining Contractual Term, Exercisable	4 years 2 months
Outstanding Options, Intrinsic Value \| $	$ 7,185
Expected to Vest Options, Intrinsic Value \| $	4,312
Exercisable Options, Intrinsic Value \| $	$ 2,873

Share-Based Compensation - Option Summary (Details)	12 Months Ended
Share-Based Compensation - Option Summary (Details)	Dec. 31, 2018 $ / shares shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Number of Outstanding Options, Exercise Price Range \| shares	122,072
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range	5 years
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range	$ 116.39
Number of Exercisable Options, Exercise Price Range \| shares	35,437
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range	$ 94.17
$50.01 - $60.00
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	50.01
Exercise Price Range, Upper Range Limit	$ 60
Number of Outstanding Options, Exercise Price Range \| shares	874
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range	1 year 2 months
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range	$ 58.26
Number of Exercisable Options, Exercise Price Range \| shares	874
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range	$ 58.26
$60.01 - $70.00
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	60.01
Exercise Price Range, Upper Range Limit	$ 70
Number of Outstanding Options, Exercise Price Range \| shares	0
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range	0 years
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range	$ 0
Number of Exercisable Options, Exercise Price Range \| shares	0
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range	$ 0
$70.01 - $80.00
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	70.01
Exercise Price Range, Upper Range Limit	$ 80
Number of Outstanding Options, Exercise Price Range \| shares	42,272
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range	4 years 1 month
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range	$ 72.19
Number of Exercisable Options, Exercise Price Range \| shares	19,791
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range	$ 72.26
$80.01 - $90.00
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	80.01
Exercise Price Range, Upper Range Limit	$ 90
Number of Outstanding Options, Exercise Price Range \| shares	2,797
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range	3 years 2 months
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range	$ 87.3
Number of Exercisable Options, Exercise Price Range \| shares	2,797
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range	$ 87.3
$90.01 - $130.00
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	90.01
Exercise Price Range, Upper Range Limit	$ 130
Number of Outstanding Options, Exercise Price Range \| shares	0
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range	0 years
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range	$ 0
Number of Exercisable Options, Exercise Price Range \| shares	0
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range	$ 0
$130.01 - $140.00
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	130.01
Exercise Price Range, Upper Range Limit	$ 140
Number of Outstanding Options, Exercise Price Range \| shares	40,287
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range	5 years 2 months
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range	$ 134.6
Number of Exercisable Options, Exercise Price Range \| shares	11,975
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range	$ 134.6
$140.01 - $150.00
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	140.01
Exercise Price Range, Upper Range Limit	$ 150
Number of Outstanding Options, Exercise Price Range \| shares	0
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range	0 years
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range	$ 0
Number of Exercisable Options, Exercise Price Range \| shares	0
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range	$ 0
$150.01 - $160.00
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	150.01
Exercise Price Range, Upper Range Limit	$ 160
Number of Outstanding Options, Exercise Price Range \| shares	35,842
Weighted Average Contractual Life, Outstanding Options, Exercise Price Range	6 years 2 months
Weighted Average Exercise Price, Outstanding Options, Exercise Price Range	$ 151.75
Number of Exercisable Options, Exercise Price Range \| shares	0
Weighted Average Exercise Price, Exercisable Options, Exercise Price Range	$ 0

Share-Based Compensation - Options Grants (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Granted	35,842
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Granted	35,842	42,477	67,444	38,698
Dividend Yield	1.37%	1.49%	1.49%	1.55%
Expected Volatility	24.73%	25.52%	28.39%	36.32%
Risk-free Interest Rate	2.54%	1.67%	1.08%	1.22%
Expected Term (Years)	4 years	4 years	4 years	4 years

Share-Based Compensation - Option Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based Compensation Expense	$ 3,724	$ 4,190	$ 6,349
Current Year Stock Option Awards [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based Compensation Expense	310	0	0
Unrecognized Compensation Expense, Options	800
Prior Year Stock Option Awards [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based Compensation Expense	367	308	0
Unrecognized Compensation Expense, Options	400
Second Prior Year Stock Option Awards [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based Compensation Expense	332	332	282
Unrecognized Compensation Expense, Options	100
Third Prior Year Stock Option Awards [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based Compensation Expense	$ 44	$ 276	$ 276

Share-Based Compensation - Restricted Stock Rollforward (Details)	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested [Roll Forward]
Beginning Balance \| shares	72,164
Nonvested Stock Awards Granted \| shares	16,166
Nonvested Stock Awards Vested \| shares	(34,954)
Nonvested Stock Awards Forfeited \| shares	(591)
Ending Balance \| shares	52,785
Weighted Average Grant Date Fair Value, Nonvested Stock Awards, Beginning of Period \| $ / shares	$ 91.03
Weighted Average Grant Date Fair Value, Nonvested Stock Awards Granted \| $ / shares	152.38
Weighted Average Grant Date Fair Value, Nonvested Stock Awards Vested \| $ / shares	87.08
Weighted Average Grant Date Fair Value, Nonvested Stock Awards Forfeited \| $ / shares	121.43
Weighted Average Grant Date Fair Value, Nonvested Stock Awards, End of Period \| $ / shares	$ 112.09
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested [Roll Forward]
Beginning Balance \| shares	4,277
Nonvested Stock Awards Granted \| shares	1,549
Nonvested Stock Awards Vested \| shares	(1,176)
Nonvested Stock Awards Forfeited \| shares	0
Ending Balance \| shares	4,650
Weighted Average Grant Date Fair Value, Nonvested Stock Awards, Beginning of Period \| $ / shares	$ 95.53
Weighted Average Grant Date Fair Value, Nonvested Stock Awards Granted \| $ / shares	153.84
Weighted Average Grant Date Fair Value, Nonvested Stock Awards Vested \| $ / shares	87.3
Weighted Average Grant Date Fair Value, Nonvested Stock Awards Forfeited \| $ / shares	0
Weighted Average Grant Date Fair Value, Nonvested Stock Awards, End of Period \| $ / shares	$ 117.03

Other Income (Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
Other Income (Expense) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Income and Expenses [Abstract]
Income from Third Party License Fees	$ 862	$ 861	$ 978
Foreign Exchange Gains (Losses), Net	(807)	891	172
(Loss) Gain on Fixed Asset Disposals, Net	657	(79)	50
Non-Income Tax Refunds and Other Related Credits	668	1,015	398
Pension And Post Retirement Benefit Costs Nonservice Components	(2,285)	(4,234)	(2,302)
Insurance Solvency Recovery	90	600	0
Other Nonoperating Income	425	380	338
Other Nonoperating Expense	(252)	(152)	(126)
Other Income (Expense), Net	$ (642)	(718)	$ (492)
Property Plant And Equipment Additional Disclosures	In addition, gain (loss) on fixed asset disposals, net, during the year ended December 31, 2018 and 2017 includes a $0.6 million gain and a $0.1 million loss, respectively, on the sale of held-for-sale assets in each period.
Foreign Currency Transactions Description	Foreign exchange (losses) gains, net, during the year ended December 31, 2018 include both a foreign currency transaction loss of approximately $0.4 million related to hyper-inflationary accounting for the Company’s Argentina subsidiary effective July 1, 2018 and a foreign currency transaction gain of approximately $0.4 million related to the liquidation of an inactive legal entity.
Defined Benefit Plan Benefit Obligation Increase Decrease For Remeasurement Due To Settlement		$ 1,900

Income Taxes - Components of Expense and Earnings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current Income Tax Expense (Benefit) [Abstract]
Federal	$ 6,583	$ 21,265	$ 4,680
State	(1,844)	2,529	518
Foreign	12,114	14,105	12,540
Current Income Tax Expense (Benefit), Total	16,853	37,899	17,738
Deferred Income Tax Expense (Benefit) [Abstract]
Federal	7,859	6,889	4,601
State	(173)	(36)	104
Foreign	511	(3,099)	783
Income Tax Expense (Benefit), Total	25,050	41,653	23,226
Components Of Earnings Before Taxes [Abstract]
Domestic	27,387	10,468	31,175
Foreign	55,711	50,200	52,834
Income before taxes and equity in net income of associated companies	$ 83,098	$ 60,668	$ 84,009

Income Taxes - Deferred Tax Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Retirement benefits	$ 3,532	$ 5,472
Allowance for doubtful accounts	1,160	1,134
Insurance and litigation reserves	396	497
Postretirement benefits	896	1,056
Supplemental retirement benefits	2,862	2,679
Performance incentives	4,347	3,779
Equity-based compensation	753	1,071
Insurance settlement	4,374	4,581
Operating loss carryforward	8,434	8,602
Foreign tax credit and other credits	1,929	3,043
Uncertain tax positions	(400)	(410)
Other	2,645	2,816
Deferred Tax Assets, Gross, Total	30,928	34,320
Valuation allowance	(7,520)	(7,401)
Total deferred income tax assets, net	23,408	26,919
Depreciation	4,049	4,444
Amortization and other	13,497	15,373
Foreign Pension and Other	1,062	1,295
Unremitted Earnings	7,857	0
Total deferred income tax liabilities	$ 26,465	$ 21,112

Income Taxes - Valuation Allowance Rollforward (Details) - Valuation Allowance of Deferred Tax Assets [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances, Beginning Balance	$ 7,401	$ 6,344	$ 6,259
Additional Valuation Allowance	650	1,127	294
Allowance Utilization and Other	(471)	(61)	(187)
Effect of Exchange Rate Changes	(60)	(9)	(22)
Valuation Allowance, Ending Balance	$ 7,520	$ 7,401	$ 6,344

Income Taxes - Net Deferred Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Taxes on Income and Uncertain Tax Positions [Abstract]
Deferred Tax Assets Net Noncurrent	$ 6,946	$ 15,460
Non-current deferred tax liabilities	10,003	9,653
Deferred Tax (Liability) Asset Net	$ (3,057)	$ 5,807

Income Taxes - Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income Tax Provision at the Federal Statutory Tax Rate	$ 17,458	$ 21,229	$ 29,403
Unremitted Earnings	7,857	0	0
Transition tax	(3,118)	18,388	0
Revaluation of deferred tax assets and liabilities	0	4,470	0
Global Intangible Low Taxed Income	1,211	0	0
Foreign Derived Intangible Income	(1,034)	0	0
Non-deductible acquisition expenses	1,019	4,779	696
Share-based compensation	259	(1,419)	0
Differences in Tax Rates on Foreign Earnings and Remittances	1,081	(2,663)	(2,862)
Foreign Dividends	0	0	2,939
Excess Foreign Tax Credit Utilization	0	(2,761)	(5,493)
Research and Development Activities Credit Utilization	(230)	(235)	(238)
Uncertain Tax Positions	(79)	(651)	(833)
U.S. Domestic Production Activities Deduction	0	(1,155)	(875)
State Income Tax Provisions, Net	196	569	357
Non-deductible Entertainment and Business Meals Expense	415	248	238
Miscellaneous Items, Net	15	854	(106)
Income Tax Expense (Benefit), Total	$ 25,050	$ 41,653	$ 23,226

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
Income Taxes - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred Tax Assets, Net	$ 23,408	$ 26,919
Defered Tax Liabilties, Net	26,465	21,112
Undistributed Earnings of Foreign Subsidiaries	210,000
Income Tax Reconciliation Change In Enacted Tax Rate	$ (3,118)	$ 18,388	$ 0
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate	35.00%
Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate	21.00%
U.S. Tax Reform Act	On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as U.S. Tax Reform. U.S. Tax Reform included multiple changes to the U.S. tax code with varying effects on the Company’s 2017 results, including, but not limited to, (i) a revaluation of the Company’s U.S. deferred tax assets and liabilities based upon the reduction of the U.S. federal statutory corporate income tax rate from 35% to 21% and (ii) implementation of a new system of taxation for non-U.S. earnings which eliminates U.S. federal income taxes on dividends from certain foreign subsidiaries and imposes a one-time transition tax on the deemed repatriation of undistributed earnings of certain foreign subsidiaries that is payable over eight years. U.S. Tax Reform also made changes to the U.S. tax code that have impacted 2018 and will impact future years, including, but not limited to, (i) reduction of the U.S. federal statutory corporate tax rate; (ii) elimination of the corporate alternative minimum tax; (iii) the creation of the base erosion anti-abuse tax, a new minimum tax; (iv) a general elimination of U.S. federal income taxes on dividends from foreign subsidiaries; (v) a new provision designed to tax global intangible low-taxed income (“GILTI”), which allows for the possibility of using foreign tax credits and a deduction of up to 50 percent to offset the income tax liability (subject to some limitations); (vi) a new limitation on deductible interest expense; (vii) the repeal of the U.S. production activity deduction; (viii) limitations on the deductibility of certain executive compensation; (ix) limitations on the use of foreign tax credits to reduce the U.S. income tax liability; (x) a reduction in the dividends received deduction from 70% to 50% (in the case of less-than-20%-owned subsidiaries) and from 80% to 65% (in the case of less-than-80%-owned subsidiaries); and (xi) limitations on net operating losses generated after December 31, 2017 to 80 percent of taxable income. Also, in 2017, the Securities and Exchange Commission issued guidance on accounting for the tax effects of U.S. Tax Reform and provided a one-year measurement period for companies to complete the accounting. The Company’s initial analysis of the impact of U.S. Tax Reform resulted in an incremental tax expense of $22.2 million recorded during the fourth quarter of 2017. U.S. Tax Reform reduced the U.S. federal statutory corporate tax rate from 35% to 21% effective January 1, 2018. Consequently, the Company recorded a decrease in U.S. net deferred tax assets of approximately $4.5 million with a corresponding net adjustment to deferred income tax expense during the fourth quarter of 2017. This initial estimate was not adjusted during 2018. The Transition Tax is a tax on previously untaxed accumulated and current earnings and profits of certain of the Company’s foreign subsidiaries as of either the November 2, 2017 or December 31, 2017 measurement date provided within U.S. Tax Reform. The Company made a reasonable estimate of its Transition Tax and recorded a gross provisional Transition Tax obligation during the fourth quarter of 2017 of $18.4 million, or $17.8 million, net of the impact of eliminating U.S. Federal income taxes on dividends from certain foreign subsidiaries received during 2017. Subsequent to numerous temporary regulations, notices, and other formal guidance published by the Internal Revenue Service (“IRS”), U.S. Treasury, and various state taxing authorities in 2018, the Company completed its accounting for the tax effects of U.S. Tax Reform as of December 22, 2018 and refined the total incremental tax expense related to U.S. Tax Reform to approximately $28.0 million. Based on proposed regulations published by the U.S. federal and state taxing authorities, the Company recorded a $2.5 million tax benefit to adjust its net Transition Tax to $15.3 million. The Company elected to pay its Transition Tax in installments over eight years as provided for in U.S. Tax Reform. In addition, the Company recorded deferred income tax expense of $0.3 million in 2018 related to the deductibility of certain executive compensation based on formal guidance issued by the IRS in 2018. As a result of the impacts from U.S. Tax Reform, the Company re-evaluated its global cash strategy resulting in a change to its indefinite reinvestment assertion attributable to a portion of its undistributed foreign earnings and recognized a deferred tax liability and corresponding deferred tax expense of $7.9 million, which primarily represents the Company’s estimate of the non-U.S. income taxes the Company will incur to ultimately remit those earnings to the U.S.
Domestic Country [Member]
Defered Tax Liabilties, Net	$ 2,000
Foreign Tax Authority [Member]
Operating Loss Carryforwards	6,600
Operating Loss Carryforwards, Valuation Allowance	400
Foreign Tax Authority [Member] \| Expiration In Next Year [Member]
Operating Loss Carryforwards	0
Foreign Tax Authority [Member] \| Expiration In Year Two [Member]
Operating Loss Carryforwards	0
Foreign Tax Authority [Member] \| Expiration In Year Three [Member]
Operating Loss Carryforwards	0
Foreign Tax Authority [Member] \| Expiration In Year Four [Member]
Operating Loss Carryforwards	0
Foreign Tax Authority [Member] \| Expiration In Year Five [Member]
Operating Loss Carryforwards	0
Foreign Tax Authority [Member] \| Expiration In Year Six [Member]
Operating Loss Carryforwards	$ 600

Income Taxes - Uncertain Tax Positions - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Uncertain Tax Positions [Abstract]
Unrecognized Tax Benefits	$ 7,050	$ 6,761	$ 6,240	$ 11,032
Accrued Interest	600	600
Accrued Penalties	800	1,000
Unrecognized Tax Benefits Tax Penalties Income	200	700	200
Unrecognized Tax Benefits Interest Income On Income Taxes	100	200	700
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations	1,292	2,116	5,744
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound	900
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound	900
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 2,200	$ 2,200	$ 1,800
The Netherlands [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2012
United Kingdom [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2013
Brazil [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2000
Spain [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2014
China [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2014
Italy [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2007
Income Tax Examination Description	As previously reported, the Italian tax authorities have assessed additional tax due from the Company’s subsidiary, Quaker Italia S.r.l., relating to the tax years 2007 through 2013. The Company has filed for competent authority relief from these assessments under the Mutual Agreement Procedures (“MAP”) of the Organization for Economic Co-Operation and Development for all years except 2007. During the second quarter of 2018, the Italian tax authorities assessed additional tax due from Quaker Italia, S.r.l., relating to the tax years 2014 and 2015. The Company met with the Italian tax authorities in the fourth quarter of 2018 to discuss these assessments and no resolution was agreed upon, so the Company filed an appeal with the first level of tax court in Italy. If the appeal is not successful in materially reducing the assessed tax, then the Company will further evaluate its options including potentially filing for competent authority relief from these assessments under MAP, consistent with the Company’s previous filings for 2008 through 2013.
Mexico [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2013
India [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2017
Internal Revenue Service (IRS) [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2015
State and Local Jurisdiction [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2009

Income Taxes - Uncertain Tax Positions - Tabular Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits, Beginning Balance	$ 6,761	$ 6,240	$ 11,032
Decrease in unrecognized tax benefits taken in prior periods	(183)	(308)	(869)
Increase in Unrecognized Tax Benefits Taken in Current Period	2,023	2,347	1,921
Decrease in Unrecognized Tax Benefits Due to Lapse of Statute of Limitations	(1,292)	(2,116)	(5,744)
(Decrease) Due to Foreign Exchange Rates	(259)		(100)
Increase Due to Foreign Exchange Rates		598
Unrecognized Tax Benefits, Ending Balance	$ 7,050	$ 6,761	$ 6,240

Earnings Per Share - Basic (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net income attributable to Quaker Chemical Corporation	$ 7,805	$ 19,690	$ 19,246	$ 12,732	$ (9,762)	$ 11,142	$ 11,906	$ 6,992	$ 59,473	$ 20,278	$ 61,403
Less: Income Allocated to Participating Securities									(253)	(137)	(515)
Net income available to common shareholders									$ 59,220	$ 20,141	$ 60,888
Basic weighted average common shares outstanding									13,268,047	13,204,872	13,136,138
Basic earnings per common share	$ 0.59	$ 1.48	$ 1.44	$ 0.96	$ (0.73)	$ 0.84	$ 0.9	$ 0.53	$ 4.46	$ 1.53	$ 4.64

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

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+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Earnings Per Share - Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net income attributable to Quaker Chemical Corporation	$ 7,805	$ 19,690	$ 19,246	$ 12,732	$ (9,762)	$ 11,142	$ 11,906	$ 6,992	$ 59,473	$ 20,278	$ 61,403
Less: income allocated to participating securities									(252)	(137)	(514)
Net income available to common shareholders									$ 59,221	$ 20,141	$ 60,889
Basic weighted average common shares outstanding									13,268,047	13,204,872	13,136,138
Effect of Dilutive Securities									36,685	41,074	24,331
Diluted weighted average common shares outstanding									13,304,732	13,245,946	13,160,469
Diluted earnings per common share	$ 0.58	$ 1.47	$ 1.44	$ 0.95	$ (0.73)	$ 0.83	$ 0.89	$ 0.52	$ 4.45	$ 1.52	$ 4.63

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

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+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Earnings Per Share - Antidilutive Shares (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Antidilutive Shares	1,808	3,671	678

Restricted Cash (Details) - USD ($) $ in Thousands	12 Months Ended
Restricted Cash (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	$ 104,147	$ 89,879	$ 88,818	$ 81,053
Restricted Cash	20,278	21,171	21,883	22,874
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents	$ 124,425	$ 111,050	$ 110,701	$ 103,927
Loss Contingency, Settlement Agreement, Terms	The Company has restricted cash recorded in Other assets related to proceeds from an inactive subsidiary of the Company which previously executed separate settlement and release agreements with two of its insurance carriers for an original total value of $35.0 million. The proceeds of both settlements are restricted and can only be used to pay claims and costs of defense associated with the subsidiary’s asbestos litigation. The proceeds of the settlement and release agreements have been deposited into interest bearing accounts which earned $0.2 million and less than $0.1 million in the years ended December 31, 2018 and 2017, respectively, offset by $1.1 million and $0.8 million of net payments in 2018 and 2017, respectively.

Accounts Receivable - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts Receivable and Allowance for Doubtful Accounts [Abstract]
Accounts Receivable Gross Current	$ 207.3	$ 213.8
Accounts Receivable Greater Than 90 Days Past Due	13.2	15.2
Business Combination, Acquired Receivables, Estimated Uncollectible	$ 0.0	$ 0.0	$ 0.1
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable Additional Narrative Disclosure	Included in exchange rate changes and other adjustments for the year ended December 31, 2018 is a reclassification of $0.3 million to Other assets related to certain customer receivables due greater than a year. There were no similar adjustments in 2017 or 2016. Included in write-offs charged to allowance during the years ended December 31, 2017 and 2016 were outstanding receivables related to certain prior year customer bankruptcies, which the Company previously reserved for, but settled during 2017 and 2016, respectively.

- Definition

Further narrative disclosure of claims held for amounts due a company. Examples include trade accounts receivables, notes receivables, loans receivables, etc.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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+ Details

Allowance For Doubtful Accounts - Rollforward (Details) - Allowance for Doubtful Accounts [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	$ 5,457	$ 7,220	$ 7,818
Charged to Costs and Expenses	493	137	1,375
Write-Offs Charged to Allowance	(295)	(2,206)	(1,949)
Effect of Exchange Rate Changes	(468)	306	(24)
Ending Balance	$ 5,187	$ 5,457	$ 7,220

Inventory (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Inventories [Abstract]
Raw Materials And Supplies	$ 48,134	$ 44,439
Work-In-Process and Finished Goods	45,956	42,782
Inventories	$ 94,090	$ 87,221

Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property Plant And Equipment Gross Abstract
Land	$ 10,170	$ 10,635
Building and Improvements	84,980	87,111
Machinery and Equipment	151,180	153,312
Construction In Progress	7,907	4,932
Property, Plant and Equipment, Gross, Total	254,237	255,990
Less: Accumulated Depreciation	(170,314)	(169,286)
Property, Plant and Equipment, Net, Total	$ 83,923	$ 86,704

Property, Plant and Equipment - Narrative (Details) $ in Millions	Dec. 31, 2018 USD ($)
Property, Plant and Equipment [Abstract]
Capital Leased Assets Gross	$ 0.1

Goodwill Assets (Details) - USD ($) $ in Thousands	12 Months Ended
Goodwill Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Goodwill Roll Forward
Goodwill, Beginning Balance	$ 86,034	$ 80,804
Goodwill Additions	0	1,832
Goodwill, Translation Adjustments	(2,701)	3,398
Goodwill, Ending Balance	83,333	86,034
North America [Member]
Goodwill Roll Forward
Goodwill, Beginning Balance	47,571	45,490
Goodwill Additions	0	1,832
Goodwill, Translation Adjustments	(268)	249
Goodwill, Ending Balance	47,303	47,571
EMEA [Member]
Goodwill Roll Forward
Goodwill, Beginning Balance	20,504	18,189
Goodwill Additions	0
Goodwill Reductions		0
Goodwill, Translation Adjustments	(1,169)	2,315
Goodwill, Ending Balance	19,335	20,504
Asia Pacific [Member]
Goodwill Roll Forward
Goodwill, Beginning Balance	15,456	14,566
Goodwill Additions	0	0
Goodwill, Translation Adjustments	(869)	890
Goodwill, Ending Balance	14,587	15,456
South America [Member]
Goodwill Roll Forward
Goodwill, Beginning Balance	2,503	2,559
Goodwill Additions	0	0
Goodwill, Translation Adjustments	(395)	(56)
Goodwill, Ending Balance	$ 2,108	$ 2,503

Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Finite Lived Intangible Assets Gross [Abstract]
Finite Lived Customer Lists, Gross	$ 74,989	$ 76,581
Trademarks, Formulations And Product Technology	33,275	33,025
Other Finite Lived Intangible Assets, Gross	5,840	6,114
Total	114,104	115,720
Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets Accumulated Amortization	51,622	45,217
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets Accumulated Amortization	29,587	25,394
Trademarks Formulations And Product Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets Accumulated Amortization	16,469	14,309
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets Accumulated Amortization	$ 5,566	$ 5,514

Intangible Assets - Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization	$ 7,341	$ 7,368	$ 7,009

Intangible Assets - Future Amortization (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
For the Year ended December 31, 2019	$ 7,160
For the Year ended December 31, 2020	6,879
For the Year ended December 31, 2021	6,529
For the Year ended December 31, 2022	6,374
For the Year ended December 31, 2023	$ 6,155

Intangible Assets - Indefinite Lived (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Indefinite Lived Intangible Assets Excluding Goodwill [Abstract]
Indefinite Lived Trademarks	$ 1.1	$ 1.1

Investment in Associated Companies - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Equity Method Investments [Line Items]
Equity Method Investments	$ 21,316	$ 25,690
Nippon Quaker (Japan) [Member]
Schedule Of Equity Method Investments [Line Items]
Equity Method Investment Ownership Percentage	50.00%
Nippon Quaker (Japan) [Member] \| Asia Pacific [Member]
Schedule Of Equity Method Investments [Line Items]
Equity Method Investments	$ 6,200
Kelko (Venezuela) [Member]
Schedule Of Equity Method Investments [Line Items]
Equity Method Investment Ownership Percentage	50.00%
Kelko (Venezuela) [Member] \| South America [Member]
Schedule Of Equity Method Investments [Line Items]
Equity Method Investments	$ 0
Kelko (Panama) [Member]
Schedule Of Equity Method Investments [Line Items]
Equity Method Investment Ownership Percentage	50.00%
Kelko (Panama) [Member] \| South America [Member]
Schedule Of Equity Method Investments [Line Items]
Equity Method Investments	$ 400
Primex (Barbados) [Member]
Schedule Of Equity Method Investments [Line Items]
Equity Method Investment Ownership Percentage	33.00%
Primex (Barbados) [Member] \| North America [Member]
Schedule Of Equity Method Investments [Line Items]
Equity Method Investments	$ 14,700

Investments in Associated Companies - Summarized Financial Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Manufacturing And Services [Member]
Equity Method Investment Summarized Financial Information Abstract
Current Assets	$ 43,581	$ 37,683
Non-current Assets	990	936
Current Liabilities	29,632	24,858
Non-current Liabilities	1,685	1,457
Equity Method Investment Summarized Financial Information Income Statement [Abstract]
Revenue	43,875	42,555	$ 41,448
Gross Profit	12,983	13,440	13,082
Income Before Income Taxes	2,494	2,900	2,289
Net Income	1,874	1,471	1,210
Captive Insurance Company [Member]
Equity Method Investment Summarized Financial Information Abstract
Total Assets	103,705	120,154
Total Liabilities	53,049	54,258
Equity Method Investment Summarized Financial Information Income Statement [Abstract]
Revenue	5,841	14,042	5,632
Income Before Income Taxes	3,688	11,705	5,622
Net Income	$ 2,954	$ 7,788	$ 5,148

Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Other Assets [Abstract]
Restricted Insurance Settlement	$ 20,278	$ 21,171
Uncertain Tax Positions	4,861	4,543
Supplemental Retirement Income Program	1,491	1,594
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent	3,656	1,184
Other	1,769	1,557
Total	$ 32,055	$ 30,049

Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Other Current Liabilities [Abstract]
Non-Income Taxes	$ 8,462	$ 9,196
Accrued Interest	4,340	884
Professional Fees	3,831	5,019
Selling Expenses	3,582	2,846
Freight	2,188	1,780
Customer Advances and Sales Return Reserves	2,187	1,507
Current Income Taxes Payable	1,358	841
Legal	1,067	1,169
Accrued Rent and Facilities	763	775
Other	3,330	3,304
Accrued Liabilities, Current, Total	$ 31,108	$ 27,321

Debt - Table (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt [Abstract]
Credit facilities	$ 24,034	$ 48,514
Industrial development bonds	10,000	15,000
Municipality-Related Loans	2,549	3,290
Other debt obligations (including capital leases)	21	0
Debt And Capital Lease Obligations	36,604	66,804
Short-term Debt (including capital leases)	0	0
Current portion of long-term debt	(670)	(5,736)
Long-term Debt and Capital Lease Obligations	$ 35,934	$ 61,068

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References + Details

Debt - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
Debt - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Line Of Credit	$ 24,034	$ 48,514
Line of Credit, Current Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity	300,000
Line Of Credit Facility Maximum Borrowing Capacity	$ 400,000
Line of Credit Facility, Covenant Compliance	As of December 31, 2018 and 2017, the Company’s consolidated total debt to adjusted EBITDA ratio was below 1.0 to 1, and the Company was also in compliance with all of its other covenants.
Line of Credit Facility, Covenant Terms	The Credit Facility has certain financial and other covenants, with the key financial covenant requiring that the Company’s consolidated total debt to adjusted EBITDA ratio cannot exceed 3.50 to 1.
Long-term Debt, Weighted Average Interest Rate	1.00%	1.88%
Debt Instrument Maturity Date Description	During the fourth quarter of 2018, the Credit Facility was amended and restated to extend the maturity date to March 15, 2020.
Ohio Department Of Development [Member]
Debt Instrument [Line Items]
Carrying Amount of Long-Term Debt	$ 800	$ 1,100
Ohio Department of Development Term Loan	$ 3,500
Debt Instrument Interest Rate Stated Percentage	2.00%
Debt Instrument Interest Rate Stated Percentage In Year Four	3.00%
Debt Instrument Maturity Date Description	Principal repayment on this loan began in September 2010 with its final maturity being in February 2021.
Industrial Development Bond Due 2018 [Member]
Debt Instrument [Line Items]
Carrying Amount of Long-Term Debt		$ 5,000
Debt Instrument Interest Rate Stated Percentage		5.60%
Industrial Development Bond Due 2028 [Member]
Debt Instrument [Line Items]
Carrying Amount of Long-Term Debt	$ 10,000
Debt Instrument Interest Rate Stated Percentage	5.26%
Local Government Loans [Member]
Debt Instrument [Line Items]
Carrying Amount of Long-Term Debt	$ 1,800	$ 2,200
Debt Instrument Maturity Date Description	These loans mature periodically, with the last maturity occurring in 2028.

Debt - Maturity Schedules (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Long Term Debt By Maturity Abstract
2019	$ 670
2020	24,730
2021	398
2022	270
2023	$ 240

Pension and Other Postretirement Benefits - Funded Status Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at Beginning of Year	$ 150,586
Fair Value of Plan Assets at End of Year	144,241	$ 150,586
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Non-current Asset	3,656	1,184
Current Liabilities	(1,211)	(1,108)
Non-current Liabilities	(32,360)	(35,548)
Domestic [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at Beginning of Year	51,964
Fair Value of Plan Assets at End of Year	49,415	51,964
Domestic [Member] \| Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	62,977	67,254
Service Cost	383	337	$ 298
Interest Cost	1,847	1,932	2,114
Employee Contributions	0	0
Benefits Paid	(4,330)	(4,031)
Plan Settlements	0	(4,341)
Plan Expense and Premiums Paid	0	0
Actuarial (gain) Loss	(2,143)	1,826
Translation Difference and Other	0	0
Benefit Obligation at End of Year	58,734	62,977	67,254
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at Beginning of Year	51,964	49,197
Actual Return on Plan Assets	457	6,865
Employer Contributions	1,574	4,574
Employee Contributions	0	0
Benefits Paid	(4,330)	(4,031)
Plan Settlements	0	(4,341)
Plan Expenses and Premiums Paid	(250)	(300)
Translation Difference	0	0
Fair Value of Plan Assets at End of Year	49,415	51,964	49,197
Defined Benefit Plan, Funded Status of Plan	(9,319)	(11,013)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Non-current Asset	3,656	1,184
Current Liabilities	(559)	(560)
Non-current Liabilities	(12,416)	(11,637)
Net Amount Recognized	(9,319)	(11,013)
Amounts Not Yet Reflected in Net Periodic Benefit Costs and Included in Accumulated Other Comprehensive Income (Loss) [Abstract]
Prior Service credit (cost)	0	(59)
Accumulated Loss	(25,310)	(27,133)
Accumulated Other Comprehensive Loss ("AOCI")	(25,310)	(27,192)
Cumulative Employer Contributions In Excess Of (or Below) Net Periodic Benefit Cost	15,991	16,179
Net Amount Recognized	(9,319)	(11,013)
Domestic [Member] \| Other Postretirement Benefit Plans Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	4,729	4,730
Service Cost	7	8	10
Interest Cost	130	144	142
Employee Contributions	0	0
Benefits Paid	(317)	(448)
Plan Settlements	0	0
Plan Expense and Premiums Paid	0	0
Actuarial (gain) Loss	(443)	295
Translation Difference and Other	0	0
Benefit Obligation at End of Year	4,106	4,729	4,730
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at Beginning of Year	0	0
Actual Return on Plan Assets	0	0
Employer Contributions	317	448
Employee Contributions	0	0
Benefits Paid	(317)	(448)
Plan Settlements	0	0
Plan Expenses and Premiums Paid	0	0
Translation Difference	0	0
Fair Value of Plan Assets at End of Year	0	0	0
Defined Benefit Plan, Funded Status of Plan	(4,106)	(4,729)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Non-current Asset	0	0
Current Liabilities	(446)	(459)
Non-current Liabilities	(3,660)	(4,270)
Net Amount Recognized	(4,106)	(4,729)
Amounts Not Yet Reflected in Net Periodic Benefit Costs and Included in Accumulated Other Comprehensive Income (Loss) [Abstract]
Prior Service credit (cost)	0	0
Accumulated Loss	(338)	(823)
Accumulated Other Comprehensive Loss ("AOCI")	(338)	(823)
Cumulative Employer Contributions In Excess Of (or Below) Net Periodic Benefit Cost	(3,768)	(3,906)
Net Amount Recognized	(4,106)	(4,729)
Foreign [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at Beginning of Year	98,622
Fair Value of Plan Assets at End of Year	94,826	98,622
Foreign [Member] \| Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	118,352	103,491
Service Cost	3,426	3,219	2,378
Interest Cost	2,254	2,066	2,314
Employee Contributions	73	68
Benefits Paid	(1,639)	(2,503)
Plan Settlements	(10)	0
Plan Expense and Premiums Paid	(161)	(210)
Actuarial (gain) Loss	(5,561)	(1,164)
Translation Difference and Other	(5,418)	13,385
Benefit Obligation at End of Year	111,316	118,352	103,491
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at Beginning of Year	98,622	86,844
Actual Return on Plan Assets	(2,670)	116
Employer Contributions	5,269	2,867
Employee Contributions	73	68
Benefits Paid	(1,639)	(2,503)
Plan Settlements	(10)	0
Plan Expenses and Premiums Paid	(161)	(210)
Translation Difference	(4,658)	11,440
Fair Value of Plan Assets at End of Year	94,826	98,622	86,844
Defined Benefit Plan, Funded Status of Plan	(16,490)	(19,730)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Non-current Asset	0	0
Current Liabilities	(206)	(89)
Non-current Liabilities	(16,284)	(19,641)
Net Amount Recognized	(16,490)	(19,730)
Amounts Not Yet Reflected in Net Periodic Benefit Costs and Included in Accumulated Other Comprehensive Income (Loss) [Abstract]
Prior Service credit (cost)	1,497	1,744
Accumulated Loss	(20,089)	(22,598)
Accumulated Other Comprehensive Loss ("AOCI")	(18,592)	(20,854)
Cumulative Employer Contributions In Excess Of (or Below) Net Periodic Benefit Cost	2,102	1,124
Net Amount Recognized	(16,490)	(19,730)
Pension Plans, Defined Benefit [Member] \| Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation at Beginning of Year	181,329	170,745
Service Cost	3,809	3,556	2,676
Interest Cost	4,101	3,998	4,428
Employee Contributions	73	68
Benefits Paid	(5,969)	(6,534)
Plan Settlements	(10)	(4,341)
Plan Expense and Premiums Paid	(161)	(210)
Actuarial (gain) Loss	(7,704)	662
Translation Difference and Other	(5,418)	13,385
Benefit Obligation at End of Year	170,050	181,329	170,745
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at Beginning of Year	150,586	136,041
Actual Return on Plan Assets	(2,213)	6,981
Employer Contributions	6,843	7,441
Employee Contributions	73	68
Benefits Paid	(5,969)	(6,534)
Plan Settlements	(10)	(4,341)
Plan Expenses and Premiums Paid	(411)	(510)
Translation Difference	(4,658)	11,440
Fair Value of Plan Assets at End of Year	144,241	150,586	$ 136,041
Defined Benefit Plan, Funded Status of Plan	(25,809)	(30,743)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Non-current Asset	3,656	1,184
Current Liabilities	(765)	(649)
Non-current Liabilities	(28,700)	(31,278)
Net Amount Recognized	(25,809)	(30,743)
Amounts Not Yet Reflected in Net Periodic Benefit Costs and Included in Accumulated Other Comprehensive Income (Loss) [Abstract]
Prior Service credit (cost)	1,497	1,685
Accumulated Loss	(45,399)	(49,731)
Accumulated Other Comprehensive Loss ("AOCI")	(43,902)	(48,046)
Cumulative Employer Contributions In Excess Of (or Below) Net Periodic Benefit Cost	18,093	17,303
Net Amount Recognized	$ (25,809)	$ (30,743)

Pension and Other Postretirement Benefits - Information About Accumulated and Projected Benefit Obligations In Excess of Plan Assets (Details) - Pension Plans, Defined Benefit [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Projected Benefit Obligation	$ 124,291	$ 130,549
Accumulated Benefit Obligation	119,493	125,525
Fair Value of Plan Assets	94,826	98,622
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets [Abstract]
Projected Benefit Obligation	124,291	130,549
Fair Value of Plan Assets	94,826	98,622
Domestic [Member]
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Projected Benefit Obligation	12,975	12,197
Accumulated Benefit Obligation	11,808	11,456
Fair Value of Plan Assets	0	0
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets [Abstract]
Projected Benefit Obligation	12,975	12,197
Fair Value of Plan Assets	0	0
Foreign [Member]
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Projected Benefit Obligation	111,316	118,352
Accumulated Benefit Obligation	107,685	114,069
Fair Value of Plan Assets	94,826	98,622
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets [Abstract]
Projected Benefit Obligation	111,316	118,352
Fair Value of Plan Assets	$ 94,826	$ 98,622

Pension and Other Postretirement Benefits - Net Periodic Benefit Cost and Changes in Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Domestic [Member] \| Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service Cost	$ 383	$ 337	$ 298
Interest Cost	1,847	1,932	2,114
Expected Return on Plan Assets	(2,803)	(3,067)	(3,316)
Settlement Loss	0	1,946	0
Actuarial Loss Amortization	2,276	2,396	2,336
Prior Service (Credit) Cost Amortization	59	63	63
Net Periodic Benefit Cost	1,762	3,607	1,495
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net Loss (Gain) Arising During The Period	453	(1,672)	3,576
Prior Service (Credit) Cost Amortization	(59)	(63)	(63)
Actuarial Loss	(2,276)	(4,342)	(2,336)
Foreign Currency Exchange Rate Changes	0	0	0
Total Recognized in Other Comprehensive (Income) Loss	(1,882)	(6,077)	1,177
Total Recognized In Net Periodic Benefit Cost And Other Comprehensive Loss Or (Income)	(120)	(2,470)	2,672
Domestic [Member] \| Other Postretirement Benefit Plans Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service Cost	7	8	10
Interest Cost	130	144	142
Actuarial Loss Amortization	42	54	0
Net Periodic Benefit Cost	179	206	152
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net Loss (Gain) Arising During The Period	(443)	295	(401)
Actuarial Loss	(42)	(54)	0
Total Recognized in Other Comprehensive (Income) Loss	(485)	241	(401)
Total Recognized In Net Periodic Benefit Cost And Other Comprehensive Loss Or (Income)	(306)	447	(249)
Foreign [Member] \| Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service Cost	3,426	3,219	2,378
Interest Cost	2,254	2,066	2,314
Expected Return on Plan Assets	(2,228)	(1,994)	(2,026)
Settlement Loss	2	0	0
Actuarial Loss Amortization	881	862	839
Prior Service (Credit) Cost Amortization	(175)	(167)	(164)
Net Periodic Benefit Cost	4,160	3,986	3,341
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net Loss (Gain) Arising During The Period	(663)	715	2,401
Prior Service (Credit) Cost Amortization	175	167	164
Actuarial Loss	(883)	(862)	(839)
Foreign Currency Exchange Rate Changes	(890)	2,308	(1,347)
Total Recognized in Other Comprehensive (Income) Loss	(2,261)	2,328	379
Total Recognized In Net Periodic Benefit Cost And Other Comprehensive Loss Or (Income)	1,899	6,314	3,720
Pension Plans, Defined Benefit [Member] \| Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service Cost	3,809	3,556	2,676
Interest Cost	4,101	3,998	4,428
Expected Return on Plan Assets	(5,031)	(5,061)	(5,342)
Settlement Loss	2	1,946	0
Actuarial Loss Amortization	3,157	3,258	3,175
Prior Service (Credit) Cost Amortization	(116)	(104)	(101)
Net Periodic Benefit Cost	5,922	7,593	4,836
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net Loss (Gain) Arising During The Period	(210)	(957)	5,977
Prior Service (Credit) Cost Amortization	116	104	101
Actuarial Loss	(3,159)	(5,204)	(3,175)
Foreign Currency Exchange Rate Changes	(890)	2,308	(1,347)
Total Recognized in Other Comprehensive (Income) Loss	(4,143)	(3,749)	1,556
Total Recognized In Net Periodic Benefit Cost And Other Comprehensive Loss Or (Income)	$ 1,779	$ 3,844	$ 6,392

Pension and Other Postretirement Benefits - Amounts to be Amortized From AOCI Over Next Fiscal Year (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial Loss	$ 3,099
Prior Service (Credit) Cost	(169)
Total	2,930
Domestic [Member] \| Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial Loss	2,330
Prior Service (Credit) Cost	0
Total	2,330
Domestic [Member] \| Other Postretirement Benefit Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial Loss	0
Prior Service (Credit) Cost	0
Total	0
Foreign [Member] \| Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial Loss	769
Prior Service (Credit) Cost	(169)
Total	$ 600

Pension and Other Postretirement Benefits - Assumptions Used in Determining Benefit Obligations and Net Periodic Pension Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Health Care Cost Trend Rate For Next Year	6.20%	6.40%
Rate to Which the Cost Trend Rate is Assumed to Decline (Ultimate Trend Rate)	4.50%	4.50%
Year that Rate Reaches Ultimate Trend Rate	2037	2037
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
Effect of One Percentage Point Increase on Service and Interest Cost Components	$ 11
Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation	299
Effect of One Percentage Point Decrease on Service and Interest Cost Components	(9)
Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation	$ (311)
Domestic [Member] \| Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount Rate	4.07%	3.44%
Rate of Compensation Increase	3.63%	3.63%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount Rate	3.44%	3.88%
Expected Long-Term Return on Plan Assets	5.95%	7.00%
Rate of Compensation Increase	3.63%	3.63%
Domestic [Member] \| Other Postretirement Benefit Plans Defined Benefit [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount Rate	4.03%	3.39%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount Rate	3.39%	3.73%
Foreign [Member] \| Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount Rate	2.47%	2.31%
Rate of Compensation Increase	2.89%	2.89%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount Rate	2.33%	2.17%
Expected Long-Term Return on Plan Assets	2.22%	2.12%
Rate of Compensation Increase	2.89%	2.48%

Pension and Other Postretirement Benefits - Asset Allocations (Details) - Pension Plans, Defined Benefit [Member]	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Domestic [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Plan Asset Allocations	100.00%
Actual Plan Asset Allocations	100.00%	100.00%
Concentration Risk, Percentage	0.00%	3.00%
Domestic [Member] \| Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Plan Asset Allocations	10.00%
Actual Plan Asset Allocations	9.00%	59.00%
Domestic [Member] \| Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Plan Asset Allocations	89.00%
Actual Plan Asset Allocations	90.00%	40.00%
Domestic [Member] \| Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Plan Asset Allocations	1.00%
Actual Plan Asset Allocations	1.00%	1.00%
Foreign [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Plan Asset Allocations	100.00%
Actual Plan Asset Allocations	100.00%	100.00%
Foreign [Member] \| Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Plan Asset Allocations	24.00%
Actual Plan Asset Allocations	24.00%	25.00%
Foreign [Member] \| Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Plan Asset Allocations	76.00%
Actual Plan Asset Allocations	76.00%	75.00%

Pension and Other Postretirement Benefits - Level 3 Asset Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets at Beginning of Year	$ 150,586
Fair Value of Plan Assets at End of Year	144,241	$ 150,586
Fair Value Inputs Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets at Beginning of Year	84,520	74,819
Purchases	4,707	2,350
Settlements	(1,399)	(1,661)
Unrealized Gains	(1,723)	(1,237)
Translation Difference	(3,850)	10,249
Fair Value of Plan Assets at End of Year	82,255	84,520
Insurance Contract [Member] \| Fair Value Inputs Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets at Beginning of Year	82,092	72,778
Purchases	4,707	2,350
Settlements	(1,399)	(1,661)
Unrealized Gains	(1,817)	(1,425)
Translation Difference	(3,710)	10,050
Fair Value of Plan Assets at End of Year	79,873	82,092
Real Estate Fund [Member] \| Fair Value Inputs Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets at Beginning of Year	2,428	2,041
Purchases	0	0
Settlements	0	0
Unrealized Gains	94	188
Translation Difference	(140)	199
Fair Value of Plan Assets at End of Year	$ 2,382	$ 2,428

Pension and Other Postretirement Benefits - Cash Flow (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Minimum Cash Contributions, Next Fiscal Year	$ 5,200
Expected Benefit Payments, Next Twelve Months	6,755
Expected Benefit Payments, Year Two	6,729
Expected Benefit Payments, Year Three	7,386
Expected Benefit Payments, Year Four	7,361
Expected Benefit Payments, Year Five	8,196
Expected Benefit Payments, Five Fiscal Years Thereafter	41,319
Domestic [Member] \| Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Minimum Cash Contributions, Next Fiscal Year	500
Expected Benefit Payments, Next Twelve Months	4,515
Expected Benefit Payments, Year Two	4,286
Expected Benefit Payments, Year Three	4,220
Expected Benefit Payments, Year Four	4,237
Expected Benefit Payments, Year Five	4,860
Expected Benefit Payments, Five Fiscal Years Thereafter	22,107
Domestic [Member] \| Other Postretirement Benefit Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Minimum Cash Contributions, Next Fiscal Year	400
Expected Benefit Payments, Next Twelve Months	446
Expected Benefit Payments, Year Two	422
Expected Benefit Payments, Year Three	393
Expected Benefit Payments, Year Four	367
Expected Benefit Payments, Year Five	349
Expected Benefit Payments, Five Fiscal Years Thereafter	1,380
Foreign [Member] \| Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Minimum Cash Contributions, Next Fiscal Year	4,700
Expected Benefit Payments, Next Twelve Months	2,240
Expected Benefit Payments, Year Two	2,443
Expected Benefit Payments, Year Three	3,166
Expected Benefit Payments, Year Four	3,124
Expected Benefit Payments, Year Five	3,336
Expected Benefit Payments, Five Fiscal Years Thereafter	$ 19,212

Pension and Other Postretirement Benefits - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension and Other Postretirement Benefits [Abstract]
Value of Employer Securities Included in Plan Assets	$ 0	$ 1,500
Defined Benefit Plan Disclosure [Line Items]
Description of Defined Contribution Plan	The Company has a 401(k) plan with an employer match covering a majority of its U.S. employees. The plan allows for and the Company previously paid a nonelective contribution on behalf of participants who have completed one year of service equal to 3% of the eligible participants’ compensation in the form of Company common stock.
Non-elective Match Percentage	3.00%
Total Contribution Amount	$ 3,100	$ 2,900	$ 2,700
Defined Benefit Plan Explanation Of Significant Change In Benefit Obligation Or Plan Assets Not Apparent From Other Required Disclosures	During the second quarter of 2017, the Company’s primary noncontributory U.S. pension plan (the “U.S. Pension Plan”) offered a cash settlement to its vested terminated participants, which allowed them to receive the value of their pension benefits as a single lump sum payment. As payments from the U.S. Pension Plan for this cash out offering exceeded the service and interest cost components of the U.S. Pension Plan expense for the year ended December 31, 2017, the Company recorded a settlement charge of approximately $1.9 million. This settlement charge represented the immediate recognition into expense of a portion of the unrecognized loss within AOCI on the balance sheet in proportion to the share of the projected benefit obligation that was settled by these payments. The gross pension benefit obligation was reduced by approximately $4.0 million as a result of these payments.	Pension and postretirement benefit costs, non-service components during the year ended December 31, 2017 includes a $1.9 million pension settlement charge.
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	$ 165,300	$ 176,300
Domestic [Member] \| Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	$ 57,600	$ 62,200
Reclassification Percentage	0.00%	3.00%
Net Periodic Benefit Cost	$ 1,762	$ 3,607	1,495
Defined Benefit Plan Description Of Nature Of Event Resulting In Contractual Termination Benefits To Be Recognized In Future Period	In the fourth quarter of 2018, the Company began the process of terminating the U.S. Pension Plan after receiving Board of Director approval to do so. Prior to December 31, 2005, the U.S. Pension Plan covered substantially all employees of the Company’s U.S. subsidiary who had at least one year of eligible service and had attained age 21. Effective December 31, 2005, the U.S. Pension Plan was amended to freeze benefit accruals with respect to participants who were not part of a collective bargaining unit and effective after November 30, 2013, the U.S. Pension Plan was further amended to freeze benefit accruals for the remaining members of a collective bargaining unit. U.S. Pension Plan participants will have their benefits either converted into a lump sum cash payment or an annuity contract placed with an insurance carrier. The U.S. Pension Plan is fully-funded on a U.S. GAAP basis. In order to terminate the plan in accordance with IRS and pension benefit guaranty corporation requirements, the Company will be required to fully fund the plan on a termination basis and will commit to contribute the additional assets necessary, if any, to do so. The amount necessary to do so is not yet known but is currently estimated to be between $0 and $10 million. In addition, the Company expects to record a pension settlement charge at plan termination. This settlement charge will include the immediate recognition into expense of the unrecognized losses within AOCI on the balance sheet as of the plan termination date. The Company does not have a current estimate for this future settlement charge, however, the gross AOCI related to this plan was approximately $19 million as of December 31, 2018. The Company currently estimates that the U.S. Pension Plan termination will be completed during 2020.
Domestic [Member] \| Pension Plans, Defined Benefit [Member] \| Defined Benefit Plan Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Commingled Fund Asset Allocation	10.00%
Domestic [Member] \| Pension Plans, Defined Benefit [Member] \| Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Commingled Fund Asset Allocation	90.00%
Domestic [Member] \| Other Postretirement Benefit Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Net Periodic Benefit Cost	$ 179	206	152
Domestic [Member] \| Supplemental Employee Retirement Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Net Periodic Benefit Cost	1,600	1,400	900
Foreign [Member] \| Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	107,700	114,100
Net Periodic Benefit Cost	$ 4,160	$ 3,986	$ 3,341
Foreign [Member] \| Pension Plans, Defined Benefit [Member] \| Defined Benefit Plan Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Commingled Fund Asset Allocation	30.00%
Foreign [Member] \| Pension Plans, Defined Benefit [Member] \| Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Commingled Fund Asset Allocation	60.00%
Foreign [Member] \| Pension Plans, Defined Benefit [Member] \| Other Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Commingled Fund Asset Allocation	10.00%

Other Noncurrent Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Other Liabilities Noncurrent [Abstract]
Restricted Insurance Settlements	$ 20,278	$ 21,171
Non-current income taxes payable	7,644	15,825
Uncertain Tax Positions (Includes Interest and Penalties)	8,097	7,970
Deferred And Other Long-Term Compensation	6,886	5,905
Other	624	625
Total	$ 43,529	$ 51,496

Equity and Noncontrolling Interest - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity Class Of Treasury Stock [Line Items]
Common Stock Par Value	$ 1	$ 1
Common Stock Shares Authorized	30,000,000	30,000,000
Common Stock Shares, Issued	13,338,026	13,307,976
Shares issued for equity based comp plans	17,596
Shares issued for ESPP	3,574
Shares issued for Options exercise and Other activity	8,880
Preferred Stock Shares Authorized	10,000,000
Preferred Stock Par Or Stated Value Per Share	$ 1
Payments For Repurchase Of Common Stock	$ 0	$ 0	$ 5,859
2015 Share Repurchase [Member]
Equity Class Of Treasury Stock [Line Items]
Stock Repurchase Program Authorized Amount	$ 100,000	$ 100,000	$ 100,000
Stock Repurchased And Retired During Period Shares			83,879
Payments For Repurchase Of Common Stock			$ 5,900
Cost of Sales [Member]
Concentration Risk [Line Items]
Reclassification Percentage	30.00%	30.00%	30.00%
Operating Expense [Member]
Concentration Risk [Line Items]
Reclassification Percentage	70.00%	70.00%	70.00%

Equity and Noncontrolling Interest - AOCI Reclassifications (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	$ (65,100)	$ (87,407)	$ (73,316)
Other Comprehensive (Loss) Income, before Reclassifications, before Tax	(18,508)	21,015	(17,106)
Amounts Reclassed from AOCI	3,520	2,660	3,058
Related Tax Amounts	(627)	(1,368)	(43)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(80,715)	(65,100)	(87,407)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	(31,893)	(52,255)	(38,544)
Other Comprehensive (Loss) Income, before Reclassifications, before Tax	(17,429)	20,362	(13,711)
Amounts Reclassed from AOCI	0	0	0
Related Tax Amounts	0	0	0
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(49,322)	(31,893)	(52,255)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	(34,093)	(36,168)	(35,251)
Other Comprehensive (Loss) Income, before Reclassifications, before Tax	1,543	(1,646)	(4,229)
Amounts Reclassed from AOCI	3,085	5,154	3,075
Related Tax Amounts	(1,086)	(1,433)	237
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(30,551)	(34,093)	(36,168)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	886	1,016	479
Other Comprehensive (Loss) Income, before Reclassifications, before Tax	(2,622)	2,299	834
Amounts Reclassed from AOCI	435	(2,494)	(17)
Related Tax Amounts	459	65	(280)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	$ (842)	$ 886	$ 1,016

Business Acquisitions - Table (Details) $ in Thousands, € in Millions	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	Sep. 30, 2015 EUR (€)	Sep. 30, 2015 USD ($)
Business Acquisition [Line Items]
Finite Lived Customer Lists, Gross	$ 74,989	$ 76,581
Other Finite Lived Intangible Assets, Gross	5,840	6,114
Goodwill	$ 83,333	$ 86,034	$ 80,804
Mining [Member]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Purchase Price				$ 1,900
Verkol [Member]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Purchase Price					€ 37.7	$ 41,400

Business Acquisitions - Narrative (Details) $ in Thousands, € in Millions, ₨ in Millions, $ in Millions	3 Months Ended					12 Months Ended
	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 31, 2016 EUR (€)	Mar. 31, 2016 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2017 INR (₨)	Dec. 31, 2017 USD ($)	Jun. 30, 2017 CAD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 CAD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	Sep. 30, 2015 EUR (€)	Sep. 30, 2015 USD ($)
Business Acquisition [Line Items]
Goodwill						$ 83,333				$ 86,034				$ 80,804
Business Combination Transaction-related Expenses						19,500	$ 30,800	$ 1,500
Other current liabilities						$ 31,108				27,321
Mining [Member]
Business Acquisition [Line Items]
Cash Paid for Acquisitions															$ 1,900
Verkol [Member]
Business Acquisition [Line Items]
Cash Paid for Acquisitions																€ 37.7	$ 41,400
Post Closing Adjustment			€ 1.3	$ 1,400
Business Combination Transaction-related Expenses					$ 2,800
Mining North America [Member] \| Trademarks Formulations And Product Technology [Member]
Business Acquisition [Line Items]
Cash Paid for Acquisitions	$ 500
Intangibles	$ 1,000
Intangible Assets, Amortizable Life	10 years
Other current liabilities	$ 500
Lubricor [Member]
Business Acquisition [Line Items]
Cash Paid for Acquisitions													$ 16.0	$ 12,000
Post Closing Adjustment		$ 100
Metal Working North America [Member]
Business Acquisition [Line Items]
Cash Paid for Acquisitions											$ 7.3	$ 5,400
India [Member]
Business Acquisition [Line Items]
Cash Paid for Acquisitions									₨ 2,025.0	$ 31,800
Percentage of Voting Interests Acquired									45.00%	45.00%
Adjustments To Additional Paid In Capital Other		$ 21,200

Fair Value - Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Company Owned Life Insurance	$ 1,491	$ 1,594
Assets Fair Value Disclosure	1,491	1,594
Fair Value Inputs Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Company Owned Life Insurance	0	0
Assets Fair Value Disclosure	0	0
Fair Value Inputs Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Company Owned Life Insurance	1,491	1,594
Assets Fair Value Disclosure	1,491	1,594
Fair Value Inputs Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Company Owned Life Insurance	0	0
Assets Fair Value Disclosure	$ 0	$ 0

Commitments and Contingencies - Narrative (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Unrelated Environmental Liability Accruals	$ 200,000	$ 200,000
ACP [Member] \| Maximum [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	1,000,000
ACP [Member] \| Minimum [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	100,000
SB Decking [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 1,700,000

Commitments and Contingencies - Operating Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Operating Leases, Rent Expense	$ 7,200	$ 6,400	$ 5,600
Future Operating Lease Minimum Payments, Due Next Year	7,068
Future Operating Lease Minimum Payments, Due in Two Years	5,635
Future Operating Lease Minimum Payments, Due in Three Years	4,509
Future Operating Lease Minimum Payments, Due in Four Years	3,523
Future Operating Lease Minimum Payments, Due in Five Years	2,659
Future Operating Lease Minimum Payments, Due Therafter	$ 7,779

Quarterly Results - Unaudited (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Results (unaudited) [Abstract]
Net Sales	$ 211,481	$ 222,022	$ 221,962	$ 212,055	$ 211,072	$ 212,918	$ 201,183	$ 194,909	$ 867,520	$ 820,082	$ 746,665
Gross Profit	74,838	81,093	80,937	75,447	73,997	74,776	71,835	70,887
Operating income	20,068	24,919	22,563	20,231	17,074	14,009	17,903	13,758	87,781	62,744	85,353
Net income attributable to Quaker Chemical Corporation	$ 7,805	$ 19,690	$ 19,246	$ 12,732	$ (9,762)	$ 11,142	$ 11,906	$ 6,992	$ 59,473	$ 20,278	$ 61,403
Net income attributable to Quaker Chemical Corporation Common Shareholders - basic	$ 0.59	$ 1.48	$ 1.44	$ 0.96	$ (0.73)	$ 0.84	$ 0.9	$ 0.53	$ 4.46	$ 1.53	$ 4.64
Net income attributable to Quaker Chemical Corporation Common Shareholders - diluted	$ 0.58	$ 1.47	$ 1.44	$ 0.95	$ (0.73)	$ 0.83	$ 0.89	$ 0.52	$ 4.45	$ 1.52	$ 4.63

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Quarterly Results - Unaudited - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017
Captive Insurance Equity Affiliate [Member]
Quarterly Charges And Credits	$ 0.1	$ 0.4	$ 1.0	$ 0.4	$ 1.1	$ 0.4	$ 0.4	$ 0.6
Currency Conversion [Member]
Quarterly Charges And Credits	0.1	0.5	0.1	0.2	0.1	0.1	0.3
Cost Streamlining Initiative [Member]
Quarterly Charges And Credits								0.3
Houghton Combination-related expenses [Member]
Quarterly Charges And Credits	5.1	3.8	4.5	$ 6.1	7.7	$ 9.7	4.3	$ 9.1
U.S. Pension Plan Settlement Charge [Member]
Quarterly Charges And Credits							$ 1.9
U.S. Tax Reform Charges [Member]
Quarterly Charges And Credits	8.1	1.1	$ 1.2		22.2
Loss On Disposal Of Held For Sale Asset [Member]
Quarterly Charges And Credits					0.1
Insurance Insolvency Recovery [Member]
Quarterly Charges And Credits	$ 0.1				$ 0.6
Gain On Liquidation Of Inactive Legal Entity [Member]
Quarterly Charges And Credits		$ 0.4

Label	Element	Value
Cumulative Effect Of New Accounting Principle In Period Of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (754,000)
Stock holders Equity Including Portion Attributable To Noncontrolling Interest Adjusted Balance1	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	408,864,000
Noncontrolling Interest [Member]
Cumulative Effect Of New Accounting Principle In Period Of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	0
Stock holders Equity Including Portion Attributable To Noncontrolling Interest Adjusted Balance1	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	1,946,000
Retained Earnings [Member]
Cumulative Effect Of New Accounting Principle In Period Of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	(754,000)
Stock holders Equity Including Portion Attributable To Noncontrolling Interest Adjusted Balance1	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	365,182,000
Accumulated Other Comprehensive Income (Loss) [Member]
Cumulative Effect Of New Accounting Principle In Period Of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	0
Stock holders Equity Including Portion Attributable To Noncontrolling Interest Adjusted Balance1	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	(65,100,000)
Additional Paid-in Capital [Member]
Cumulative Effect Of New Accounting Principle In Period Of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	0
Stock holders Equity Including Portion Attributable To Noncontrolling Interest Adjusted Balance1	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	93,528,000
Common Stock [Member]
Cumulative Effect Of New Accounting Principle In Period Of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	0
Stock holders Equity Including Portion Attributable To Noncontrolling Interest Adjusted Balance1	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	$ 13,308,000

Net Sales and Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax	$ 211,481	$ 222,022	$ 221,962	$ 212,055	$ 211,072	$ 212,918	$ 201,183	$ 194,909	$ 867,520	$ 820,082	$ 746,665
North America [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									383,471	356,598	336,174
EMEA [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									233,597	226,243	200,917
Asia Pacific [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									214,157	201,008	179,131
South America [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									36,295	$ 36,233	$ 30,443
Transferred At Point In Time [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									847,886
Transferred At Point In Time [Member] \| North America [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									372,392
Transferred At Point In Time [Member] \| EMEA [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									233,372
Transferred At Point In Time [Member] \| Asia Pacific [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									206,112
Transferred At Point In Time [Member] \| South America [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									36,010
Transferred Over Time [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									19,634
Transferred Over Time [Member] \| North America [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									11,079
Transferred Over Time [Member] \| EMEA [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									225
Transferred Over Time [Member] \| Asia Pacific [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									8,045
Transferred Over Time [Member] \| South America [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									285
Primary Metals [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									413,536
Primary Metals [Member] \| North America [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									156,906
Primary Metals [Member] \| EMEA [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									102,417
Primary Metals [Member] \| Asia Pacific [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									134,395
Primary Metals [Member] \| South America [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									19,818
Metalworking [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									373,599
Metalworking [Member] \| North America [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									167,829
Metalworking [Member] \| EMEA [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									116,076
Metalworking [Member] \| Asia Pacific [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									74,867
Metalworking [Member] \| South America [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									14,827
Coatings and Other [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									80,385
Coatings and Other [Member] \| North America [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									58,736
Coatings and Other [Member] \| EMEA [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									15,104
Coatings and Other [Member] \| Asia Pacific [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									4,895
Coatings and Other [Member] \| South America [Member]
Product Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax									$ 1,650

Pension and Other Postretirement Benefits - Fair Value Hierarchy - Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	$ 93,273	$ 98,456
Fair Value of Plan Assets measured at NAV	50,968	52,130
Fair Value of Plan Assets	144,241	150,586
Fair Value Inputs Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	659	1,983
Fair Value Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	10,359	11,953
Fair Value Inputs Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	82,255	84,520	$ 74,819
Insurance Contract [Member] \| Fair Value Inputs Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	79,873	82,092
Fair Value of Plan Assets	79,873	82,092	72,778
Real Estate Fund [Member] \| Fair Value Inputs Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	2,382	2,428	$ 2,041
Domestic [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	450	1,957
Fair Value of Plan Assets	49,415	51,964
Domestic [Member] \| Fair Value Inputs Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	450	1,957
Domestic [Member] \| Fair Value Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	0	0
Domestic [Member] \| Fair Value Inputs Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	0	0
Domestic [Member] \| Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	450	449
Domestic [Member] \| Cash and Cash Equivalents [Member] \| Fair Value Inputs Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	450	449
Domestic [Member] \| Cash and Cash Equivalents [Member] \| Fair Value Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	0	0
Domestic [Member] \| Cash and Cash Equivalents [Member] \| Fair Value Inputs Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	0	0
Domestic [Member] \| Equity Securities Small Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	0	1,508
Domestic [Member] \| Equity Securities Small Cap [Member] \| Fair Value Inputs Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	0	1,508
Domestic [Member] \| Equity Securities Small Cap [Member] \| Fair Value Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	0	0
Domestic [Member] \| Equity Securities Small Cap [Member] \| Fair Value Inputs Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	0	0
Domestic [Member] \| Pooled Separate Accounts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets measured at NAV	0	1,480
Domestic [Member] \| Commingled Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets measured at NAV	48,965	48,527
Foreign [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	92,823	96,499
Fair Value of Plan Assets measured at NAV	2,003	2,123
Fair Value of Plan Assets	94,826	98,622
Foreign [Member] \| Fair Value Inputs Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	209	26
Foreign [Member] \| Fair Value Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	10,359	11,953
Foreign [Member] \| Fair Value Inputs Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	82,255	84,520
Foreign [Member] \| Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	209	26
Foreign [Member] \| Cash and Cash Equivalents [Member] \| Fair Value Inputs Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	209	26
Foreign [Member] \| Cash and Cash Equivalents [Member] \| Fair Value Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	0	0
Foreign [Member] \| Cash and Cash Equivalents [Member] \| Fair Value Inputs Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	0	0
Foreign [Member] \| Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	2,658	2,951
Foreign [Member] \| Fixed Income Funds [Member] \| Fair Value Inputs Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	0	0
Foreign [Member] \| Fixed Income Funds [Member] \| Fair Value Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	2,658	2,951
Foreign [Member] \| Fixed Income Funds [Member] \| Fair Value Inputs Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	0	0
Foreign [Member] \| Insurance Contract [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	79,873	82,092
Foreign [Member] \| Insurance Contract [Member] \| Fair Value Inputs Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	0	0
Foreign [Member] \| Insurance Contract [Member] \| Fair Value Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	0	0
Foreign [Member] \| Insurance Contract [Member] \| Fair Value Inputs Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	79,873	82,092
Foreign [Member] \| Equity Funds Diversified [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	7,701	9,002
Foreign [Member] \| Equity Funds Diversified [Member] \| Fair Value Inputs Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	0	0
Foreign [Member] \| Equity Funds Diversified [Member] \| Fair Value Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	7,701	9,002
Foreign [Member] \| Equity Funds Diversified [Member] \| Fair Value Inputs Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	0	0
Foreign [Member] \| Real Estate Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	2,382	2,428
Foreign [Member] \| Real Estate Fund [Member] \| Fair Value Inputs Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	0	0
Foreign [Member] \| Real Estate Fund [Member] \| Fair Value Inputs Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	0	0
Foreign [Member] \| Real Estate Fund [Member] \| Fair Value Inputs Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets excluding assets measured at NAV	2,382	2,428
Foreign [Member] \| Commingled Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets measured at NAV	$ 2,003	$ 2,123