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Document and Entity Information	3 Months Ended
Document and Entity Information	Mar. 31, 2019 shares
Document And Entity Information [Abstract]
Document Type	10-Q
Document period end date	Mar. 31, 2019
Amendment flag	false
Document Fiscal Year Focus	2019
Document Period Focus	Q1
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 common stock shares outstanding	13,333,668
Trading Symbol	KWR
EntityEmergingGrowthCompany	false
EntitySmallBusiness	false

Condensed Consolidated Statement of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Net sales	$ 211,210	$ 212,055
Cost of goods sold	135,443	136,608
Gross profit	75,767	75,447
Selling, general and administrative expenses	51,455	50,007
Combination-related expenses	4,483	5,209
Operating income	19,829	20,231
Other expense, net	(635)	(369)
Interest expense	(1,214)	(1,692)
Interest income	438	489
Income before taxes and equity in net income (loss) of associated companies	18,418	18,659
Taxes on income before equity in net income (loss) of associated companies	4,929	5,556
Income before equity in net income (loss) of associated companies	13,489	13,103
Equity in net income (loss) of associated companies	411	(316)
Net income	13,900	12,787
Less: Net income attributable to noncontrolling interest	56	55
Net income attributable to Quaker Chemical Corporation	$ 13,844	$ 12,732
Per share data:
Basic Earnings Per Common Share	$ 1.04	$ 0.96
Diluted Earnings per Common Share	1.03	0.95
Dividends Declared	$ 0.37	$ 0.355

Condensed Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 13,900	$ 12,787
Currency translation adjustments	(432)	6,859
Defined benefit retirement plans	706	84
Unrealized gain (loss) on available-for-sale securities	1,273	(486)
Other comprehensive income	1,547	6,457
Comprehensive income	15,447	19,244
Less: Comprehensive income attributable to noncontrolling interest	(55)	(150)
Comprehensive income attributable to Quaker Chemical Corporation	$ 15,392	$ 19,094

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

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+ Details

Condensed Consolidated Balance Sheet - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 71,960	$ 104,147
Accounts receivable, net	208,003	202,139
Inventories
Raw materials and supplies	46,337	48,134
Work-in-process and finished goods	46,610	45,956
Prepaid expenses and other current assets	18,403	18,134
Total current assets	391,313	418,510
Property, plant and equipment, at cost	254,400	254,237
Less accumulated depreciation	(172,084)	(170,314)
Net property, plant and equipment	82,316	83,923
Right of use lease asset	26,069	0
Goodwill	83,204	83,333
Other intangible assets, net	61,421	63,582
Investments in associated companies	22,726	21,316
Non-current deferred tax assets	9,333	6,946
Other assets	32,141	32,055
Total assets	708,523	709,665
Current liabilities
Short-term borrowings and current portion of long-term debt	661	670
Accounts and other payables	91,145	92,754
Accrued compensation	15,959	25,727
Other current liabilities	39,743	32,319
Total current liabilities	147,508	151,470
Long-term debt	11,720	35,934
Long-term lease liabilities	20,231	0
Non-current deferred tax liabilities	9,194	10,003
Other non-current liabilities	73,507	75,889
Total liabilities	262,160	273,296
Equity
Common stock $1 par value; authorized 30,000,000 shares; issued and outstanding 2019 - 13,333,668 shares; 2018 - 13,338,026 shares	13,334	13,338
Capital in excess of par value	96,832	97,304
Retained earnings	413,992	405,125
Accumulated other comprehensive loss	(79,167)	(80,715)
Total Quaker shareholders' equity	444,991	435,052
Noncontrolling interest	1,372	1,317
Total equity	446,363	436,369
Total liabilities and equity	$ 708,523	$ 709,665

Condensed Consolidated Balance Sheet (Parentheticals) - $ / shares	Mar. 31, 2019	Dec. 31, 2018
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	13,333,668	13,338,026

Condensed Consolidated Statement of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities
Net income	$ 13,900	$ 12,787
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	3,047	3,194
Amortization	1,812	1,853
Equity in undistributed (earnings) losses of associated companies, net of dividends	(186)	511
Deferred compensation, deferred taxes and other, net	(6,842)	428
Share-based compensation	1,012	1,083
Gain on disposal of property, plant and equipment and other assets	(9)	(52)
Insurance settlement realized	(190)	(85)
Combination related expenses, net of payements	(1,012)	2,161
Pension and other postretirement benefits contributions	(1,346)	(2,632)
(Decrease) increase in cash from changes in current assets and current liabilities, net of acquisitions:
Accounts receivable	(5,470)	(5,827)
Inventories	946	(7,758)
Prepaid expenses and other current assets	366	(1,055)
Accounts payable and accrued liabilities	(6,008)	(1,862)
Net cash provided by operating activities	20	2,746
Cash flows from investing activities
Investments in property, plant and equipment	(2,537)	(3,449)
Payments related to acquisitions, net of cash acquired	(500)	(500)
Proceeds from disposition of assets	8	29
Insurance settlement interest earned	65	19
Net cash used in investing activities	(2,964)	(3,901)
Cash flows from financing activities
Proceeds from long-term debt	0	8,166
Repayment of long-term debt	(23,948)	(197)
Dividends paid	(4,935)	(4,724)
Stock options exercised, other	(1,489)	(866)
Distributions to noncontrolling affiliate shareholders	0	(834)
Net cash (used in) provided by financing activities	(30,372)	1,545
Effect of foreign exchange rate changes on cash	1,004	2,246
Net (decrease) increase in cash, cash equivalents and restricted cash	(32,312)	2,636
Cash, cash equivalents and restricted cash at beginning of period	124,425	111,050
Cash, cash equivalents and restricted cash at end of period	$ 92,113	$ 113,686

Condensed Financial Information	3 Months Ended
Condensed Financial Information	Mar. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	Note 1 – Condensed Financial Information The condensed consolidated financial statements included herein are unaudited and have been prepared in accordance with generally accepted accounting principles in the United States (“U.S. GAAP”) for interim financial reporting and the United States Securities and Exchange Commission (“SEC”) regulations. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. In the opinion of management, the financial statements reflect all adjustments which are necessary for a fair statement of the financial position, results of operations and cash flows for the interim periods. The results for the three months ended March 31, 2019 are not necessarily indicative of the results to be expected for the full year. These financial statements should be read in conjunction with the Company’s Annual Report filed on Form 10-K for the year ended December 31, 2018. Hyper-inflationary economies Economies that have a cumulative three-year rate of inflation exceeding 100% are considered hyper-inflationary under 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 Condensed Consolidated Statements of Income. The Company has a 50-50 joint venture in a Venezuelan affiliate, Kelko Quaker Chemical, S.A. Venezuela’s economy has been considered hyper-inflationary under U.S. GAAP since 2010. During the three months ended March 31, 2018 the Company recorded a $0.2 million remeasurement loss associated with the applicable currency conversions related to Venezuela. These losses were recorded within equity in net income (loss) of associated companies in the Company’s Condensed Consolidated Statements of Income. Due to heightened foreign exchange controls and restrictions currently present within 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 March 31, 2019 and December 31, 2018, the Company has no remaining carrying value for its investment in Kelko Venezuela. 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 three months ended March 31, 2019, 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 three months ended March 31, 2019, the Company recorded a $0.2 million remeasurement loss associated with the applicable currency conversions related to Argentina. These losses were recorded within foreign exchange losses, net, which is a component of other expense, net, in the Company’s Condensed Consolidated Statements of Income.

Houghton Combination	3 Months Ended
Houghton Combination	Mar. 31, 2019
Business Combination Separately Recognized Transactions [Abstract]
Business Combination Separately Recognized Transactions [Table Text Block]	Note 2 – Houghton Combination On April 4, 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 first quarter of 2019, the Company extended the bank commitment for the New Credit Facility through July 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 or LIBOR 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 to receive final approval from the EC once certain conditions are met, including their review and approval of the final purchase agreement between Quaker, Houghton, and the buyer of the divested product lines, which was finalized and signed at the end of March 2019. The Company continues to be in productive discussions with the U.S. Federal Trade Commission (“FTC”). 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. late in the fourth quarter of 2018 and early in 2019 extended the timeline to receive the final approval. Given current information, the Company expects that final approval from the FTC and EC and closing of the combination will occur in the next couple of months. The Company incurred costs of $5.3 million and $6.1 million during the three months ended March 31, 2019 and 2018, respectively, primarily for certain legal, financial, and other advisory and consultant costs related to regulatory approvals, integration planning associated with the Combination and certain one-time labor-related costs and ticking fees. As of March 31, 2019 and December 31, 2018, the Company had current liabilities related to the Combination of $7.2 million and $8.2 million, respectively, primarily recorded within other current liabilities on its Condensed Consolidated Balance Sheets.

Recently Issued Accounting Standards	3 Months Ended
Recently Issued Accounting Standards	Mar. 31, 2019
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 Financial Accounting Standards Board (“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 certain disclosures related to 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 February 2018 that allows a reclassification from accumulated other comprehensive (loss) income (“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 was permitted. The Company adopted this guidance in the first quarter of 2019, as required, but elected not to reclassify any stranded tax effects resulting from U.S. Tax Reform, therefore adoption of this guidance did not have an impact on its financial statements. The FASB issued an accounting standard update in June 2016 related to the accounting for and disclosure of credit losses. The guidance introduces a new model for recognizing credit losses on financial instruments, including customer accounts receivable, based on an estimate of current expected credit losses. The guidance within this accounting standard update is effective for annual and interim periods beginning after December 15, 2019, and aspects of the guidance which may be applicable to Quaker should be applied on a modified retrospective basis. 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 February 2016 regarding the accounting and disclosure for leases. During 2018 and 2019, 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 and 2019 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 was permitted. As part of the Company’s implementation planning and its impact assessment related to the new lease accounting guidance, the Company developed a detailed project plan, identified and established a cross-functional implementation team and developed pre-adoption internal controls. In addition, the Company gathered an inventory of the Company’s outstanding leases globally, performed certain review procedures to ensure completeness of its lease population and abstracted required information from its lease population for inclusion within the Company’s leasing software. Also, the Company is considering how the new lease accounting guidance may impact Houghton and the pending Combination. The Company adopted the guidance in the first quarter of 2019, as required, electing to use a modified retrospective transition approach and applied transition requirements as of January 1, 2019, as permitted. 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 transition practical expedients within the new lease accounting related to lease identification, lease classification, and initial direct costs. The Company made certain accounting policy elections as a result of adopting the new lease accounting guidance which include not separating lease and non-lease components, applying a portfolio approach in the development of the Company’s discount rates, applying the short-term lease exemption and establishing a capitalization threshold policy. Adoption of the lease accounting guidance did not have a material impact on the Company’s reported earnings or cash flows, however, adoption did result in a material impact to the Company’s balance sheet to establish the right of use lease assets and associated lease liabilities. Specifically, the Company recorded a cumulative effect of an accounting change that resulted in an increase to its right of use lease assets of $27.3 million, an increase of $5.3 million of short-term lease liabilities and $21.4 million of long-term lease liabilities, a decrease in property, plant and equipment, net of $1.1 million, a decrease in other current liabilities of $0.4 million and a decrease to retained earnings of less than $0.1 million. See Note 5 of Notes to Condensed Consolidated Financial Statements.

Net Sales and Revenue Recognition

3 Months Ended

Mar. 31, 2019

Revenue From Contract With Customer [Abstract]

Revenue From Contract With Customer [Text Block]

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, Europe, Middle East and Africa (“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 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 recognized on a net reporting basis of $10.4 million and $11.6 million for the three months ended March 31, 2019 and 2018, respectively.

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 metalworking customers and generally use higher volumes of products at a single location. As previously disclosed in its Annual Report filed on Form 10-K for the year ended December 31, 2018, during 2018 the Company’s five largest customers (each composed of multiple subsidiaries or divisions with semiautonomous purchasing authority) accounted for approximately 17% of consolidated net sales, with its largest customer accounting for approximately 8% of 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 Condensed Consolidated Statements 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 has 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 Condensed 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 material contract assets recorded on its Condensed Consolidated Balance Sheets as of March 31, 2019 or December 31, 2018.

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 Condensed Consolidated Balance Sheets. The Company had approximately $1.3 million and $1.3 million of deferred revenue as of March 31, 2019 and December 31, 2018, respectively. During the three months ended March 31, 2019, the Company satisfied the associated performance obligations and recognized revenue of $1.3 million related to advance customer payments recorded as of December 31, 2018.

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. The Company has provided annual net sales information for its product lines greater than 10% in its previously filed Form 10-K for the year ended December 31, 2018, and those annual percentages are generally consistent with the current quarter’s net sales by product line. 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, approximately proportionate to the level of total sales in each region.

The following tables disaggregate the Company’s net sales by region, customer industry, and timing of revenue recognized for the three months ended March 31, 2019 and 2018. The Company has made certain reclassifications of disaggregated customer industry disclosures for the three months ended March 31, 2018 to conform with the Company’s current period customer industry segmentation.

	Three Months Ended March 31, 2019
	North						South		Consolidated
	America		EMEA		Asia/Pacific		America		Total
Net sales	$	95,253	$	56,288	$	50,527	$	9,142	$	211,210

Customer Industries
Primary metals	$	39,685	$	24,883	$	32,092	$	5,290	$	101,950
Metalworking		40,436		28,248		16,468		3,761		88,913
Coatings and other		15,132		3,157		1,967		91		20,347
	$	95,253	$	56,288	$	50,527	$	9,142	$	211,210

Timing of Revenue Recognized
Product sales at a point in time	$	92,483	$	56,234	$	48,651	$	9,064	$	206,432
Services transferred over time		2,770		54		1,876		78		4,778
	$	95,253	$	56,288	$	50,527	$	9,142	$	211,210

	Three Months Ended March 31, 2018
	North						South		Consolidated
	America		EMEA		Asia/Pacific		America		Total
Net sales	$	91,820	$	62,055	$	48,777	$	9,403	$	212,055

Customer Industries
Primary metals	$	37,558	$	27,314	$	30,907	$	5,299	$	101,078
Metalworking		40,589		31,170		17,526		3,783		93,068
Coatings and other		13,673		3,571		344		321		17,909
	$	91,820	$	62,055	$	48,777	$	9,403	$	212,055

Timing of Revenue Recognized
Product sales at a point in time	$	88,986	$	61,999	$	46,848	$	9,319	$	207,152
Services transferred over time		2,834		56		1,929		84		4,903
	$	91,820	$	62,055	$	48,777	$	9,403	$	212,055

Leases

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Leases Of Lessee Disclosure [Text Block]

Note 5 - Leases

The Company determines if an arrangement is a lease at its inception. This determination generally depends on whether the arrangement conveys the right to control the use of an identified fixed asset explicitly or implicitly for a period of time in exchange for consideration. Control of an underlying asset is conveyed if the Company obtains the rights to direct the use of, and to obtain substantially all of the economic benefits from the use of, the underlying asset. Lease expense for variable leases and short-term leases is recognized when the obligation is incurred.

The Company has operating leases for certain facilities, vehicles and machinery and equipment with remaining lease terms up to 8 years. In addition, the Company has certain land use leases with remaining lease terms up to 96 years. The lease term for all of the Company’s leases includes the non-cancellable period of the lease plus any additional periods covered by an option to extend the lease that the Company is reasonably certain it will exercise. Operating leases are included in right of use lease assets, other current liabilities and long-term lease liabilities on the Condensed Consolidated Balance Sheet. Right of use lease assets and liabilities are recognized at each lease’s commencement date based on the present value of its lease payments over its respective lease term. The Company uses the stated borrowing rate for a lease when readily determinable. When a stated borrowing rate is not available in a lease agreement, the Company uses its incremental borrowing rate based on information available at the lease’s commencement date to determine the present value of its lease payments. In determining the incremental borrowing rate used to present value each of its leases, the Company considers certain information including fully secured borrowing rates readily available to the Company and its subsidiaries. The Company has one immaterial finance lease, which is included in property, plant and equipment, current portion of long-term debt and long-term debt on the Condensed Consolidated Balance Sheet.

Operating lease expense is recognized on a straight-line basis over the lease term. Operating lease expense for the three months ended March 31, 2019 was $1.8 million. Short-term lease expense for the three months ended March 31, 2019 was $0.1 million. The Company has no material variable lease costs or sublease income for the three months ended March 31, 2019. Cash paid for operating leases during the three months ended March 31, 2019 was $1.7 million. Subsequent to the Company’s adoption of the new lease accounting guidance and cumulative effect of an accounting change on January 1, 2019, the Company recorded new right of use lease assets and associated lease liabilities of approximately $0.3 million during the three months ended March 31, 2019.

Supplemental balance sheet information related to the Company’s leases is as follows:

	March 31,
	2019
Right of use lease assets	$	26,069

Other current liabilities		5,258
Long-term lease liabilities		20,231
Total operating lease liabilities	$	25,489

Weighted average remaining lease term (years)		6.1
Weighted average discount rate		4.65%

Maturities of operating lease liabilities as of March 31, 2019 were as follows:

	March 31,
	2019
For the remainder of 2019	$	4,844
For the year ended December 31, 2020		5,465
For the year ended December 31, 2021		4,486
For the year ended December 31, 2022		3,534
For the year ended December 31, 2023		2,758
For the year ended December 31, 2024 and beyond		8,419
Total lease payments		29,506
Less: imputed interest		(4,017)
Present value of lease liabilities	$	25,489

Pursuant to the Company’s adoption of the new lease accounting guidance using a modified retrospective transition approach, as permitted, comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. As previously disclosed in its Annual Report filed on Form 10-K for the year ended December 31, 2018, the following table presents the Company’s future minimum rental commitments under operating leases as of December 31, 2018:

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

Business Segments

3 Months Ended

Mar. 31, 2019

Segment Reporting Measurement Disclosures [Abstract]

Segment Reporting Disclosure [Text Block]

Note 6 – 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 selling, general and administrative expenses (“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 table presents information about the performance of the Company’s reportable operating segments for the three months ended March 31, 2019 and 2018:

		Three Months Ended
		March 31,
		2019		2018
Net sales
	North America	$	95,253	$	91,820
	EMEA		56,288		62,055
	Asia/Pacific		50,527		48,777
	South America		9,142		9,403
Total net sales		$	211,210	$	212,055

Operating earnings, excluding indirect operating expenses
	North America	$	20,872	$	20,365
	EMEA		8,782		10,293
	Asia/Pacific		13,082		12,142
	South America		1,197		635
Total operating earnings, excluding indirect operating expenses			43,933		43,435
Combination-related expenses			(4,483)		(5,209)
Non-operating charges			(17,733)		(16,039)
Depreciation of corporate assets and amortization			(1,888)		(1,956)
Operating income			19,829		20,231
Other expense, net			(635)		(369)
Interest expense			(1,214)		(1,692)
Interest income			438		489
Income before taxes and equity in net income (loss) of associated companies		$	18,418	$	18,659

Inter-segment revenues for the three months ended March 31, 2019 and 2018 were $1.8 million and $3.1 million for North America, $5.3 million and $5.6 million for EMEA, less than $0.1 million and $0.4 million for Asia/Pacific and less than $0.1 million and $0 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 above.

Share-Based Compensation

3 Months Ended

Mar. 31, 2019

Share Based Compensation [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 Condensed Consolidated Statements of Income for the three months ended March 31, 2019 and 2018:

	Three Months Ended
	March 31,
	2019		2018
Stock options	$	260	$	252
Nonvested restricted stock awards and restricted stock units		698		775
Employee stock purchase plan		23		22
Director stock ownership plan		31		34
Total share-based compensation expense	$	1,012	$	1,083

During the first quarter of 2019, the Company granted 232 nonvested restricted shares under its long-term incentive plan. The Company had no grants of stock options or restricted stock units during the first quarter of 2019. Nonvested restricted shares granted are generally subject only to time vesting, generally over a three-year period. The fair value of the nonvested restricted shares granted in the first quarter of 2019 are based on the trading price of the Company’s common stock on the date of grant. The Company adjusts the grant date fair value of these awards for expected forfeitures based on historical experience.

As of March 31, 2019, unrecognized compensation expense related to stock options granted was $1.0 million, to be recognized over a weighted average remaining period of 1.6 years, unrecognized compensation expense related to the nonvested restricted shares was $1.7 million, to be recognized over a weighted average remaining period of 1.6 years, and unrecognized compensation expense related to nonvested restricted stock units was $0.2 million, to be recognized over a weighted average remaining period of 1.7 years.

Pension and Postretirement Benefits

3 Months Ended

Mar. 31, 2019

General Discussion Of Pension And Other Postretirement Benefits [Abstract]

Pension And Other Postretirement Benefits Disclosure [Text Block]

Note 8 – Pension and Other Postretirement Benefits

The components of net periodic benefit cost for the three months ended March 31, 2019 and 2018 are as follows:

	Three Months Ended March 31,
					Other
	Pension Benefits				Postretirement Benefits
		2019		2018		2019		2018
Service cost	$	986	$	988	$	2	$	2
Interest cost		1,111		1,049		35		33
Expected return on plan assets		(984)		(1,290)		—		—
Actuarial loss amortization		775		800		—		15
Prior service cost amortization		(42)		(31)		—		—
Total net periodic benefit cost	$	1,846	$	1,516	$	37	$	50

The Company previously disclosed in its Annual Report filed on Form 10-K for the year ended December 31, 2018 that the Company began the process of terminating the Company’s primary non-contributory U.S. pension plan (the “U.S. Pension Plan”) during the fourth quarter of 2018. As part of this process, and considering the fully funded status of the U.S. Pension Plan, the asset allocation of the U.S. Pension Plan was adjusted modeling a glide path that is more heavily allocated to fixed income securities with lengthened durations to match the projected liabilities. As a result, the expected return on plan assets declined during the three months ended March 31, 2019 compared to the three months ended March 31, 2018. In order to terminate the U.S. Pension Plan in accordance with IRS and Pension Benefit Guaranty Corporation requirements, the Company will be required to fully fund the U.S. Pension Plan on a termination basis and will commit to contribute additional assets if necessary, 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 related 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 the U.S. Pension Plan was approximately $19 million as of March 31, 2019. The Company currently estimates that the U.S. Pension Plan termination will be completed during 2020.

Employer Contributions

The Company previously disclosed in its Annual Report filed on Form 10-K for the year ended December 31, 2018 that it expected to make minimum cash contributions of $5.2 million to its pension plans and approximately $0.4 million to its other postretirement benefit plans in 2019. As of March 31, 2019, $2.9 million and $0.2 million of contributions have been made to the Company’s pension plans and its postretirement benefit plans, respectively.

Other Income (Expense)

3 Months Ended

Mar. 31, 2019

Other Income And Expenses [Abstract]

Other Income And Other Expense Disclosure [Text Block]

Note 9 – Other Expense, Net

The components of other expense, net for the three months ended March 31, 2019 and 2018 are as follows:

	Three Months Ended
	March 31,
	2019		2018
Income from third party license fees	$	220	$	250
Foreign exchange losses, net		(237)		(229)
Gain on fixed asset disposals, net		9		52
Non-income tax refunds and other related credits		152		36
Pension and postretirement benefit costs, non-service components		(896)		(576)
Other non-operating income		148		157
Other non-operating expense		(31)		(59)
Total other expense, net	$	(635)	$	(369)

Income Taxes and Uncertain Tax Positions	3 Months Ended
Income Taxes and Uncertain Tax Positions	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	Note 10 – Income Taxes and Uncertain Income Tax Positions The Company’s effective tax rate for the three months ended March 31, 2019 was 26.8% compared to 29.8% for the three months ended March 31, 2018. These effective tax rates include the impacts of certain non-deductible costs related to the pending Combination. The Company’s lower effective tax rate for the three months ended March 31, 2019 was largely driven by a positive impact from changes in uncertain tax positions and a shift in earnings to entities with lower effective tax rates compared to the three months ended March 31, 2018, which more than offset higher tax expense during the three months ended March 31, 2019 related to the Company recording earnings in one of its subsidiaries at a statutory tax rate of 25% while it awaits recertification of a concessionary 15% tax rate, which was available to the Company during the first three months of 2018. As previously disclosed in its Annual Report filed on Form 10-K for the year ended December 31, 2018, the Company recognized a deferred tax liability of $7.9 million in the fourth quarter of 2018 related to the Company’s estimate of non-U.S. taxes it will incur to repatriate certain foreign earnings. The Company incurred tax payments related to the repatriation of a portion of these foreign earnings during the first quarter of 2019 and reduced this deferred tax liability by approximately $3.2 million. As of March 31, 2019, the Company’s cumulative liability for gross unrecognized tax benefits was $7.7 million. As of December 31, 2018, the Company’s cumulative liability for gross unrecognized tax benefits was $7.1 million. The Company continues to recognize interest and penalties associated with uncertain tax positions as a component of taxes on income before equity in net income (loss) of associated companies in its Condensed Consolidated Statements of Income. The Company recognized an expense of $0.1 million for interest and an expense of less than $0.1 million for penalties in its Condensed Consolidated Statement of Income for the three months ended March 31, 2019, and recognized an expense of $0.1 million for interest and an expense of $0.1 million for penalties in its Condensed Consolidated Statement of Income for the three months ended March 31, 2018. As of March 31, 2019, the Company had accrued $0.7 million for cumulative interest and $0.8 million for cumulative penalties in its Condensed Consolidated Balance Sheets, compared to $0.6 million for cumulative interest and $0.8 million for cumulative penalties accrued at December 31, 2018. During the three months ended March 31, 2019 and 2018, the Company recognized a decrease of less than $0.1 million and $0.1 million, respectively, in its cumulative liability for gross unrecognized tax benefits due to the expiration of the applicable statutes of limitations for certain tax years. The Company estimates that during the year ending December 31, 2019 it will reduce its cumulative liability for gross unrecognized tax benefits by approximately $1.0 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. 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 and the United Kingdom from 2013, Mexico, 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 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 March 31, 2019, the Company believes it has adequate reserves for uncertain tax positions with respect to these and all other audits.

Earnings Per Share

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Earnings Per Share [Text Block]

Note 11 – Earnings Per Share

The following table summarizes earnings per share calculations for the three months ended March 31, 2019 and 2018:

		Three Months Ended
		March 31,
		2019		2018
Basic earnings per common share
	Net income attributable to Quaker Chemical Corporation	$	13,844	$	12,732
	Less: income allocated to participating securities		(46)		(62)
	Net income available to common shareholders	$	13,798	$	12,670
	Basic weighted average common shares outstanding		13,291,589		13,245,026
Basic earnings per common share		$	1.04	$	0.96

Diluted earnings per common share
	Net income attributable to Quaker Chemical Corporation	$	13,844	$	12,732
	Less: income allocated to participating securities		(46)		(62)
	Net income available to common shareholders	$	13,798	$	12,670
	Basic weighted average common shares outstanding		13,291,589		13,245,026
	Effect of dilutive securities		46,901		33,580
	Diluted weighted average common shares outstanding		13,338,490		13,278,606
Diluted earnings per common share		$	1.03	$	0.95

Certain stock options and restricted stock units are not included in the diluted earnings per share calculation when the effect would have been anti-dilutive. There were no anti-dilutive shares for the three months ended March 31, 2019. Comparatively, the calculated amount of anti-dilutive shares not included in the diluted earnings per share calculation were 2,862 for the three months ended March 31, 2018

Restricted Cash

3 Months Ended

Mar. 31, 2019

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

Cash and Cash equivalents disclosure [Text Block]

Note 12 – 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 $0.1 million and less than $0.1 million in the three months ended March 31, 2019 and 2018, respectively, offset by $0.2 million and less than $0.1 million of net payments during the three months ended March 31, 2019 and 2018 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. The following table provides a reconciliation of cash, cash equivalents and restricted cash as of March 31, 2019 and 2018 and December 31, 2018 and 2017:

	March 31,				December 31,
	2019		2018		2018		2017
Cash and cash equivalents	$	71,960	$	92,581	$	104,147	$	89,879
Restricted cash included in other assets		20,153		21,105		20,278		21,171
Cash, cash equivalents and restricted cash	$	92,113	$	113,686	$	124,425	$	111,050

Goodwill and Intangible Assets

3 Months Ended

Mar. 31, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill And Intangible Assets Disclosure [Text Block]

Note 13 – Goodwill and Other Intangible Assets

The Company completes its annual 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 has recorded no impairment charges in its past.

Changes in the carrying amount of goodwill for the three months ended March 31, 2019 were as follows:

		North						South
		America		EMEA		Asia/Pacific		America		Total
Balance as of December 31, 2018		$	47,303	$	19,335	$	14,587	$	2,108	$	83,333
	Currency translation adjustments		82		(414)		232		(29)		(129)
Balance as of March 31, 2019		$	47,385	$	18,921	$	14,819	$	2,079	$	83,204

Gross carrying amounts and accumulated amortization for definite-lived intangible assets as of March 31, 2019 and December 31, 2018 were as follows:

	Gross Carrying				Accumulated
	Amount				Amortization
	2019		2018		2019		2018
Customer lists and rights to sell	$	74,574	$	74,989	$	30,565	$	29,587
Trademarks, formulations and product technology		33,128		33,275		17,011		16,469
Other		5,826		5,840		5,631		5,566
Total definite-lived intangible assets	$	113,528	$	114,104	$	53,207	$	51,622

The Company recorded $1.8 million and $1.9 million of amortization expense for the three months ended March 31, 2019 and 2018, respectively. Estimated annual aggregate amortization expense for the current year and subsequent five years is as follows:

For the year ended December 31, 2019	$	7,148
For the year ended December 31, 2020		6,841
For the year ended December 31, 2021		6,491
For the year ended December 31, 2022		6,337
For the year ended December 31, 2023		6,120
For the year ended December 31, 2024		5,694

The Company has two indefinite-lived intangible assets totaling $1.1 million for trademarks as of March 31, 2019 and December 31, 2018.

Debt	3 Months Ended
Debt	Mar. 31, 2019
Debt [Abstract]
Debt Disclosure [Text Block]	Note 14 – Debt 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 March 31, 2019 and December 31, 2018, the Company’s 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 first quarter of 2019, the Credit Facility was amended and restated to extend the maturity date to July 15, 2020. As of March 31, 2019 the Company had no Credit Facility borrowings outstanding. As of December 31, 2018, the Company had Credit Facility borrowings of $24.0 million. The Company’s other debt obligations are primarily industrial development bonds and municipality-related loans, which totaled $12.4 million as of March 31, 2019 and $12.6 million as of December 31, 2018.

Equity and Noncontrolling Interest

3 Months Ended

Mar. 31, 2019

Stockholders Equity [Abstract]

Stockholders Equity Note Disclosure [Text Block]

Note 15 – Equity

The following tables present the changes in equity, net of tax, for the three months ended March 31, 2019 and 2018:

									Accumulated
					Capital in				Other
			Common		Excess of		Retained		Comprehensive		Noncontrolling
			Stock		Par Value		Earnings		Loss		Interest		Total
Balance at December 31, 2018			$	13,338	$	97,304	$	405,125	$	(80,715)	$	1,317	$	436,369
	Cumulative effect of an accounting change			—		—		(44)		—		—		(44)
Balance at January 1, 2019				13,338		97,304		405,081		(80,715)		1,317		436,325
	Net income			—		—		13,844		—		56		13,900
	Amounts reported in other comprehensive
		income (loss)		—		—		—		1,548		(1)		1,547
	Dividends ($0.37 per share)			—		—		(4,933)		—		—		(4,933)
	Share issuance and equity-based
		compensation plans		(4)		(472)		—		—		—		(476)
Balance at March 31, 2019			$	13,334	$	96,832	$	413,992	$	(79,167)	$	1,372	$	446,363

Balance at December 31, 2017			$	13,308	$	93,528	$	365,936	$	(65,100)	$	1,946	$	409,618
	Cumulative effect of an accounting change			—		—		(754)		—		—		(754)
Balance at January 1, 2018				13,308		93,528		365,182		(65,100)		1,946		408,864
	Net income			—		—		12,732		—		55		12,787
	Amounts reported in other comprehensive
		income		—		—		—		6,362		95		6,457
	Dividends ($0.355 per share)			—		—		(4,729)		—		—		(4,729)
	Distributions to noncontrolling affiliate
		shareholders		—		—		—		—		(834)		(834)
	Share issuance and equity-based
		compensation plans		15		203		—		—		—		218
Balance at March 31, 2018			$	13,323	$	93,731	$	373,185	$	(58,738)	$	1,262	$	422,763

The following tables show the reclassifications from and resulting balances of AOCI for the three months ended March 31, 2019 and 2018:

							Unrealized
			Currency		Defined		Gain (Loss) in
			Translation		Benefit		Available-for-
			Adjustments		Retirement Plans		Sale Securities		Total
Balance at December 31, 2018			$	(49,322)	$	(30,551)	$	(842)	$	(80,715)
	Other comprehensive (loss) income before
		reclassifications		(431)		160		1,707		1,436
	Amounts reclassified from AOCI			—		733		(96)		637
	Current period other comprehensive (loss) income			(431)		893		1,611		2,073
	Related tax amounts			—		(187)		(338)		(525)
	Net current period other comprehensive (loss) income			(431)		706		1,273		1,548
Balance at March 31, 2019			$	(49,753)	$	(29,845)	$	431	$	(79,167)

Balance at December 31, 2017			$	(31,893)	$	(34,093)	$	886	$	(65,100)
	Other comprehensive income (loss) before
		reclassifications		6,764		(697)		(443)		5,624
	Amounts reclassified from AOCI			—		783		(172)		611
	Current period other comprehensive income (loss)			6,764		86		(615)		6,235
	Related tax amounts			—		(2)		129		127
	Net current period other comprehensive income (loss)			6,764		84		(486)		6,362
Balance at March 31, 2018			$	(25,129)	$	(34,009)	$	400	$	(58,738)

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 (loss) of associated companies. The amounts reported in other comprehensive income for non-controlling interest are related to currency translation adjustments.

Business Acquisitions	3 Months Ended
Business Acquisitions	Mar. 31, 2019
Business Combinations [Abstract]
Business Combination Disclosure [Text Block]	Note 16 – Business Combinations and Asset 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 paid during the first quarter of 2019. The results of operations of acquired businesses and assets are included in the Condensed Consolidated Statements of Income from their respective acquisition dates. Transaction expenses associated with acquisitions are included in SG&A in the Company’s Condensed Consolidated Statements of Income. Certain pro forma and other information is not presented, as the operations of the acquired businesses and assets are not material to the overall operations of the Company for the periods presented.

Fair Value Measurements

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Fair Value Disclosures [Text Block]

Note 17 – Fair Value Measurements

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 March 31, 2019
	Total			Using Fair Value Hierarchy
Assets	Fair Value			Level 1		Level 2		Level 3
Company-owned life insurance	$	1,635		$	—	$	1,635	$	—
Total	$	1,635		$	—	$	1,635	$	—

			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	$	—

The fair values of Company-owned life insurance assets are based on quotes for like instruments with similar credit ratings and terms. The Company did not hold any Level 3 investments as of March 31, 2019 or December 31, 2018, 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	3 Months Ended
Commitments and Contingencies	Mar. 31, 2019
Commitments And Contingencies Disclosure [Abstract]
Commitments And Contingencies Disclosure [Text Block]	Note 18 – Commitments and Contingencies The Company previously disclosed in its Annual Report filed on Form 10-K for the year ended December 31, 2018 that AC Products, Inc. (“ACP”), a wholly owned subsidiary, has been operating a groundwater treatment system to hydraulically contain groundwater contamination emanating from ACP’s site, the principal contaminant of which is perchloroethylene. As of March 31, 2019, ACP believes it is close to meeting the conditions for closure of the groundwater treatment system but continues to operate this system while in discussions with the relevant authorities. As of March 31, 2019, the Company believes that the range of potential-known liabilities associated with the balance of the 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 determined by groundwater modeling. Costs of operation include the operation and maintenance of the extraction well, groundwater monitoring and program management. The Company previously disclosed in its Annual Report filed on Form 10-K for the year ended December 31, 2018 that 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. During the three months ended March 31, 2019, there have been no significant changes to the facts or circumstances of this previously disclosed matter, aside from on-going claims, immaterial settlements and routine payments associated with this litigation. 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). 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 March 31, 2019 and December 31, 2018, respectively, to provide for such anticipated future environmental assessments and remediation costs. 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.

Accounting Policies (Policies)	3 Months Ended
Accounting Policies (Policies)	Mar. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis Of Accounting Policy [Policy Text Block]	The condensed consolidated financial statements included herein are unaudited and have been prepared in accordance with generally accepted accounting principles in the United States (“U.S. GAAP”) for interim financial reporting and the United States Securities and Exchange Commission (“SEC”) regulations. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. In the opinion of management, the financial statements reflect all adjustments which are necessary for a fair statement of the financial position, results of operations and cash flows for the interim periods. The results for the three months ended March 31, 2019 are not necessarily indicative of the results to be expected for the full year. These financial statements should be read in conjunction with the Company’s Annual Report filed on Form 10-K for the year ended December 31, 2018.
Revenue Recognition [Policy Text Block]	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. 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 Condensed Consolidated Balance Sheets
Revenue From Contract With Customer [Policy Text Block]	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 recognized on a net reporting basis at the amount of the administrative fee earned by the Company for ordering the goods.
Goodwill And Intangible Assets, Goodwill, Policy [Policy Text Block]	The Company completes its annual 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.
Lessee Leases [Policy Text Block]	The Company determines if an arrangement is a lease at its inception. This determination generally depends on whether the arrangement conveys the right to control the use of an identified fixed asset explicitly or implicitly for a period of time in exchange for consideration. Control of an underlying asset is conveyed if the Company obtains the rights to direct the use of, and to obtain substantially all of the economic benefits from the use of, the underlying asset. Lease expense for variable leases and short-term leases is recognized when the obligation is incurred

Net Sales and Revenue Recognition (Tables)

3 Months Ended

Mar. 31, 2019

Disaggregation Of Revenue [Abstract]

Disaggregation Of Revenue [Table Text Block]

	Three Months Ended March 31, 2019
	North						South		Consolidated
	America		EMEA		Asia/Pacific		America		Total
Net sales	$	95,253	$	56,288	$	50,527	$	9,142	$	211,210

Customer Industries
Primary metals	$	39,685	$	24,883	$	32,092	$	5,290	$	101,950
Metalworking		40,436		28,248		16,468		3,761		88,913
Coatings and other		15,132		3,157		1,967		91		20,347
	$	95,253	$	56,288	$	50,527	$	9,142	$	211,210

Timing of Revenue Recognized
Product sales at a point in time	$	92,483	$	56,234	$	48,651	$	9,064	$	206,432
Services transferred over time		2,770		54		1,876		78		4,778
	$	95,253	$	56,288	$	50,527	$	9,142	$	211,210

	Three Months Ended March 31, 2018
	North						South		Consolidated
	America		EMEA		Asia/Pacific		America		Total
Net sales	$	91,820	$	62,055	$	48,777	$	9,403	$	212,055

Customer Industries
Primary metals	$	37,558	$	27,314	$	30,907	$	5,299	$	101,078
Metalworking		40,589		31,170		17,526		3,783		93,068
Coatings and other		13,673		3,571		344		321		17,909
	$	91,820	$	62,055	$	48,777	$	9,403	$	212,055

Timing of Revenue Recognized
Product sales at a point in time	$	88,986	$	61,999	$	46,848	$	9,319	$	207,152
Services transferred over time		2,834		56		1,929		84		4,903
	$	91,820	$	62,055	$	48,777	$	9,403	$	212,055

Leases (Tables)

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Operating Leases Of Lessee Disclosure [Text Block]

	March 31,
	2019
Right of use lease assets	$	26,069

Other current liabilities		5,258
Long-term lease liabilities		20,231
Total operating lease liabilities	$	25,489

Weighted average remaining lease term (years)		6.1
Weighted average discount rate		4.65%

Lessee Operating Lease Liability Maturity [Table Text Block]

	March 31,
	2019
For the remainder of 2019	$	4,844
For the year ended December 31, 2020		5,465
For the year ended December 31, 2021		4,486
For the year ended December 31, 2022		3,534
For the year ended December 31, 2023		2,758
For the year ended December 31, 2024 and beyond		8,419
Total lease payments		29,506
Less: imputed interest		(4,017)
Present value of lease liabilities	$	25,489

Contractual Obligation Fiscal Year Maturity Schedule [Table Text Block]

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

Business Segments (Tables)

3 Months Ended

Mar. 31, 2019

Segment Reporting Measurement Disclosures [Abstract]

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

		Three Months Ended
		March 31,
		2019		2018
Net sales
	North America	$	95,253	$	91,820
	EMEA		56,288		62,055
	Asia/Pacific		50,527		48,777
	South America		9,142		9,403
Total net sales		$	211,210	$	212,055

Operating earnings, excluding indirect operating expenses
	North America	$	20,872	$	20,365
	EMEA		8,782		10,293
	Asia/Pacific		13,082		12,142
	South America		1,197		635
Total operating earnings, excluding indirect operating expenses			43,933		43,435
Combination-related expenses			(4,483)		(5,209)
Non-operating charges			(17,733)		(16,039)
Depreciation of corporate assets and amortization			(1,888)		(1,956)
Operating income			19,829		20,231
Other expense, net			(635)		(369)
Interest expense			(1,214)		(1,692)
Interest income			438		489
Income before taxes and equity in net income (loss) of associated companies		$	18,418	$	18,659

Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

Share Based Compensation [Abstract]

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

	Three Months Ended
	March 31,
	2019		2018
Stock options	$	260	$	252
Nonvested restricted stock awards and restricted stock units		698		775
Employee stock purchase plan		23		22
Director stock ownership plan		31		34
Total share-based compensation expense	$	1,012	$	1,083

Pension and Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2019

General Discussion Of Pension And Other Postretirement Benefits [Abstract]

Schedule Of Net Benefit Costs [Table Text Block]

	Three Months Ended March 31,
					Other
	Pension Benefits				Postretirement Benefits
		2019		2018		2019		2018
Service cost	$	986	$	988	$	2	$	2
Interest cost		1,111		1,049		35		33
Expected return on plan assets		(984)		(1,290)		—		—
Actuarial loss amortization		775		800		—		15
Prior service cost amortization		(42)		(31)		—		—
Total net periodic benefit cost	$	1,846	$	1,516	$	37	$	50

Other Income (Expense) (Tables)

3 Months Ended

Mar. 31, 2019

Other Income And Expenses [Abstract]

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

	Three Months Ended
	March 31,
	2019		2018
Income from third party license fees	$	220	$	250
Foreign exchange losses, net		(237)		(229)
Gain on fixed asset disposals, net		9		52
Non-income tax refunds and other related credits		152		36
Pension and postretirement benefit costs, non-service components		(896)		(576)
Other non-operating income		148		157
Other non-operating expense		(31)		(59)
Total other expense, net	$	(635)	$	(369)

Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

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

		Three Months Ended
		March 31,
		2019		2018
Basic earnings per common share
	Net income attributable to Quaker Chemical Corporation	$	13,844	$	12,732
	Less: income allocated to participating securities		(46)		(62)
	Net income available to common shareholders	$	13,798	$	12,670
	Basic weighted average common shares outstanding		13,291,589		13,245,026
Basic earnings per common share		$	1.04	$	0.96

Diluted earnings per common share
	Net income attributable to Quaker Chemical Corporation	$	13,844	$	12,732
	Less: income allocated to participating securities		(46)		(62)
	Net income available to common shareholders	$	13,798	$	12,670
	Basic weighted average common shares outstanding		13,291,589		13,245,026
	Effect of dilutive securities		46,901		33,580
	Diluted weighted average common shares outstanding		13,338,490		13,278,606
Diluted earnings per common share		$	1.03	$	0.95

Restricted Cash (Tables)

3 Months Ended

Mar. 31, 2019

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

Schedule of Cash and Cash Equivalents [Table Text Block]

	March 31,				December 31,
	2019		2018		2018		2017
Cash and cash equivalents	$	71,960	$	92,581	$	104,147	$	89,879
Restricted cash included in other assets		20,153		21,105		20,278		21,171
Cash, cash equivalents and restricted cash	$	92,113	$	113,686	$	124,425	$	111,050

Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2019

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, 2018		$	47,303	$	19,335	$	14,587	$	2,108	$	83,333
	Currency translation adjustments		82		(414)		232		(29)		(129)
Balance as of March 31, 2019		$	47,385	$	18,921	$	14,819	$	2,079	$	83,204

Schedule Of Finite Lived Intangible Assets [Table Text Block]

	Gross Carrying				Accumulated
	Amount				Amortization
	2019		2018		2019		2018
Customer lists and rights to sell	$	74,574	$	74,989	$	30,565	$	29,587
Trademarks, formulations and product technology		33,128		33,275		17,011		16,469
Other		5,826		5,840		5,631		5,566
Total definite-lived intangible assets	$	113,528	$	114,104	$	53,207	$	51,622

Schedule of Finite Lived Intangible Assets Future Amortization Expense [TableText Block]

For the year ended December 31, 2019	$	7,148
For the year ended December 31, 2020		6,841
For the year ended December 31, 2021		6,491
For the year ended December 31, 2022		6,337
For the year ended December 31, 2023		6,120
For the year ended December 31, 2024		5,694

Equity and Noncontrolling Interest (Tables)

3 Months Ended

Mar. 31, 2019

Stockholders Equity [Abstract]

Schedule of Stockholders Equity [Table Text Block]

									Accumulated
					Capital in				Other
			Common		Excess of		Retained		Comprehensive		Noncontrolling
			Stock		Par Value		Earnings		Loss		Interest		Total
Balance at December 31, 2018			$	13,338	$	97,304	$	405,125	$	(80,715)	$	1,317	$	436,369
	Cumulative effect of an accounting change			—		—		(44)		—		—		(44)
Balance at January 1, 2019				13,338		97,304		405,081		(80,715)		1,317		436,325
	Net income			—		—		13,844		—		56		13,900
	Amounts reported in other comprehensive
		income (loss)		—		—		—		1,548		(1)		1,547
	Dividends ($0.37 per share)			—		—		(4,933)		—		—		(4,933)
	Share issuance and equity-based
		compensation plans		(4)		(472)		—		—		—		(476)
Balance at March 31, 2019			$	13,334	$	96,832	$	413,992	$	(79,167)	$	1,372	$	446,363

Balance at December 31, 2017			$	13,308	$	93,528	$	365,936	$	(65,100)	$	1,946	$	409,618
	Cumulative effect of an accounting change			—		—		(754)		—		—		(754)
Balance at January 1, 2018				13,308		93,528		365,182		(65,100)		1,946		408,864
	Net income			—		—		12,732		—		55		12,787
	Amounts reported in other comprehensive
		income		—		—		—		6,362		95		6,457
	Dividends ($0.355 per share)			—		—		(4,729)		—		—		(4,729)
	Distributions to noncontrolling affiliate
		shareholders		—		—		—		—		(834)		(834)
	Share issuance and equity-based
		compensation plans		15		203		—		—		—		218
Balance at March 31, 2018			$	13,323	$	93,731	$	373,185	$	(58,738)	$	1,262	$	422,763

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

							Unrealized
			Currency		Defined		Gain (Loss) in
			Translation		Benefit		Available-for-
			Adjustments		Retirement Plans		Sale Securities		Total
Balance at December 31, 2018			$	(49,322)	$	(30,551)	$	(842)	$	(80,715)
	Other comprehensive (loss) income before
		reclassifications		(431)		160		1,707		1,436
	Amounts reclassified from AOCI			—		733		(96)		637
	Current period other comprehensive (loss) income			(431)		893		1,611		2,073
	Related tax amounts			—		(187)		(338)		(525)
	Net current period other comprehensive (loss) income			(431)		706		1,273		1,548
Balance at March 31, 2019			$	(49,753)	$	(29,845)	$	431	$	(79,167)

Balance at December 31, 2017			$	(31,893)	$	(34,093)	$	886	$	(65,100)
	Other comprehensive income (loss) before
		reclassifications		6,764		(697)		(443)		5,624
	Amounts reclassified from AOCI			—		783		(172)		611
	Current period other comprehensive income (loss)			6,764		86		(615)		6,235
	Related tax amounts			—		(2)		129		127
	Net current period other comprehensive income (loss)			6,764		84		(486)		6,362
Balance at March 31, 2018			$	(25,129)	$	(34,009)	$	400	$	(58,738)

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

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

			Fair Value Measurements at March 31, 2019
	Total			Using Fair Value Hierarchy
Assets	Fair Value			Level 1		Level 2		Level 3
Company-owned life insurance	$	1,635		$	—	$	1,635	$	—
Total	$	1,635		$	—	$	1,635	$	—

			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	$	—

Condensed Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Inflationary Percentage	100.00%
Equity Method Investment	$ 22,726		$ 21,316
Kelko (Venezuela) [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment	$ 0		$ 0
Argentina Subsidiary [Member]
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts [Line Items]
Currency Conversion Impacts Of Hyper Inflationary Accounting	During the three months ended March 31, 2019, the Company recorded a $0.2 million remeasurement loss associated with the applicable currency conversions related to Argentina.
Venezuela Subsidiary [Member]
Financial Statement Line Items With Differences In Reported Amount And Reporting Currency Denominated Amounts [Line Items]
Currency Conversion Impacts Of Hyper Inflationary Accounting		During the three months ended March 31, 2018 the Company recorded a $0.2 million remeasurement loss associated with the applicable currency conversions related to Venezuela.
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	3 Months Ended
Houghton Combination (Details) - USD ($) $ in Millions	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Business Combination Separately Recognized Transactions [Abstract]
Business Combination Separately Recognized Transactions Description	On April 4, 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 first quarter of 2019, the Company extended the bank commitment for the New Credit Facility through July 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 or LIBOR 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 to receive final approval from the EC once certain conditions are met, including their review and approval of the final purchase agreement between Quaker, Houghton, and the buyer of the divested product lines, which was finalized and signed at the end of March 2019. The Company continues to be in productive discussions with the U.S. Federal Trade Commission (“FTC”). 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. late in the fourth quarter of 2018 and early in 2019 extended the timeline to receive the final approval. Given current information, the Company expects that final approval from the FTC and EC and closing of the combination will occur in the next couple of months.
Business Combination Transaction-Related Expenses	$ 5.3	$ 6.1
Business Combination Separately Recognized Transactions Liabilities Recognized	$ 7.2		$ 8.2

Recently Issued Accounting Standards - Narrative (Details)	3 Months Ended
	Mar. 31, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
New Accounting Pronouncement Or Change In Accounting Principle Description Of Prior period Information Retrospectively Adjusted	Adoption of the lease accounting guidance did not have a material impact on the Company’s reported earnings or cash flows, however, adoption did result in a material impact to the Company’s balance sheet to establish the right of use lease assets and associated lease liabilities. Specifically, the Company recorded a cumulative effect of an accounting change that resulted in an increase to its right of use lease assets of $27.3 million, an increase of $5.3 million of short-term lease liabilities and $21.4 million of long-term lease liabilities, a decrease in property, plant and equipment, net of $1.1 million, a decrease in other current liabilities of $0.4 million and a decrease to retained earnings of less than $0.1 million.

Net Sales and Revenue Recognition - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Revenues [Abstract]
Net Reporting Amount	$ 10.4	$ 11.6
Deferred Revenue	1.3		$ 1.3
Deferred Revenue Revenue Recognized	$ 1.3
Top Five Customers Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage			17.00%
Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage			8.00%

Net Sales and Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Product Information [Line Items]
Net sales	$ 211,210	$ 212,055
North America [Member]
Product Information [Line Items]
Net sales	95,253	91,820
EMEA [Member]
Product Information [Line Items]
Net sales	56,288	62,055
Asia Pacific [Member]
Product Information [Line Items]
Net sales	50,527	48,777
South America [Member]
Product Information [Line Items]
Net sales	9,142	9,403
Transferred At Point In Time [Member]
Product Information [Line Items]
Net sales	206,432	207,152
Transferred At Point In Time [Member] \| North America [Member]
Product Information [Line Items]
Net sales	92,483	88,986
Transferred At Point In Time [Member] \| EMEA [Member]
Product Information [Line Items]
Net sales	56,234	61,999
Transferred At Point In Time [Member] \| Asia Pacific [Member]
Product Information [Line Items]
Net sales	48,651	46,848
Transferred At Point In Time [Member] \| South America [Member]
Product Information [Line Items]
Net sales	9,064	9,319
Transferred Over Time [Member]
Product Information [Line Items]
Net sales	4,778	4,903
Transferred Over Time [Member] \| North America [Member]
Product Information [Line Items]
Net sales	2,770	2,834
Transferred Over Time [Member] \| EMEA [Member]
Product Information [Line Items]
Net sales	54	56
Transferred Over Time [Member] \| Asia Pacific [Member]
Product Information [Line Items]
Net sales	1,876	1,929
Transferred Over Time [Member] \| South America [Member]
Product Information [Line Items]
Net sales	78	84
Primary Metals [Member]
Product Information [Line Items]
Net sales	101,950	101,078
Primary Metals [Member] \| North America [Member]
Product Information [Line Items]
Net sales	39,685	37,558
Primary Metals [Member] \| EMEA [Member]
Product Information [Line Items]
Net sales	24,883	27,314
Primary Metals [Member] \| Asia Pacific [Member]
Product Information [Line Items]
Net sales	32,092	30,907
Primary Metals [Member] \| South America [Member]
Product Information [Line Items]
Net sales	5,290	5,299
Metalworking [Member]
Product Information [Line Items]
Net sales	88,913	93,068
Metalworking [Member] \| North America [Member]
Product Information [Line Items]
Net sales	40,436	40,589
Metalworking [Member] \| EMEA [Member]
Product Information [Line Items]
Net sales	28,248	31,170
Metalworking [Member] \| Asia Pacific [Member]
Product Information [Line Items]
Net sales	16,468	17,526
Metalworking [Member] \| South America [Member]
Product Information [Line Items]
Net sales	3,761	3,783
Coatings And Other [Member]
Product Information [Line Items]
Net sales	20,347	17,909
Coatings And Other [Member] \| North America [Member]
Product Information [Line Items]
Net sales	15,132	13,673
Coatings And Other [Member] \| EMEA [Member]
Product Information [Line Items]
Net sales	3,157	3,571
Coatings And Other [Member] \| Asia Pacific [Member]
Product Information [Line Items]
Net sales	1,967	344
Coatings And Other [Member] \| South America [Member]
Product Information [Line Items]
Net sales	$ 91	$ 321

Leases Narrative (Details) $ in Millions	3 Months Ended
Leases Narrative (Details) $ in Millions	Mar. 31, 2019 USD ($)
Leases [Abstract]
Operating Lease Cost	$ 1.8
Short Term Lease Cost	0.1
Operating Lease Payments	1.7
Operating Lease Assets Acquired	$ 0.3
Land [Member]
Lessee Lease Description [Line Items]
Lessee Operating Lease Term Of Contract	96 years
Facilities, vehicles, and machinery and equipment [Member]
Lessee Lease Description [Line Items]
Lessee Operating Lease Term Of Contract	8 years

Leases Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Operating Lease Right Of Use Asset	$ 26,069	$ 0
Operating Lease Liability Current	5,258
Operating Lease Liability Noncurrent	20,231	$ 0
Operating Lease Liability	$ 25,489
Operating Lease Weighted Average Remaining Lease Term 1	6 years 1 month 6 days
Operating Lease Weighted Average Discount Rate Percent	4.65%

Leases Maturity of Lease Liabilities (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Operating Leases Future Minimum Payments Due [Abstract]
For the remainder of 2019	$ 4,844
For the year ended December 31, 2020	5,465
For the year ended December 31, 2021	4,486
For the year ended December 31, 2022	3,534
For the year ended December 31, 2023	2,758
For the year ended December 31, 2024 and beyond	8,419
Total lease payments	29,506
Less: imputed interest	(4,017)
Present value of lease liabilities	$ 25,489

Leases Operating Leases (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Leases [Abstract]
For the year ended 2019	$ 7,068
For the year ended 2020	5,635
For the year ended 2021	4,509
For the year ended 2022	3,523
For the year ended 2023	2,659
For the year ended 2024 and beyond	$ 7,779

Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended
Business Segments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Net sales	$ 211,210	$ 212,055
Operating earnings, excluding indirect operating expenses	43,933	43,435
Reconciliation from Segment Totals to Consolidated [Abstract]
Combination-related expenses	(4,483)	(5,209)
Nonoperating charges	(17,733)	(16,039)
Depreciation of corporate assets and amortization	(1,888)	(1,956)
Operating income	19,829	20,231
Other expense, net	(635)	(369)
Interest expense	(1,214)	(1,692)
Interest income	438	489
Income before taxes and equity in net income (loss) of associated companies	18,418	18,659
North America [Member]
Segment Reporting Information [Line Items]
Net sales	95,253	91,820
Operating earnings, excluding indirect operating expenses	20,872	20,365
North America [Member] \| Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net sales	1,800	3,100
EMEA [Member]
Segment Reporting Information [Line Items]
Net sales	56,288	62,055
Operating earnings, excluding indirect operating expenses	8,782	10,293
EMEA [Member] \| Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net sales	5,300	5,600
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net sales	50,527	48,777
Operating earnings, excluding indirect operating expenses	13,082	12,142
Asia Pacific [Member] \| Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net sales	100	400
South America [Member]
Segment Reporting Information [Line Items]
Net sales	9,142	9,403
Operating earnings, excluding indirect operating expenses	1,197	635
South America [Member] \| Intersegment Sales Elimination [Member]
Segment Reporting Information [Line Items]
Net sales	$ 100	$ 0

Share-Based Compensation - Expense Table (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based Compensation Expense	$ 1,012	$ 1,083
Stock Options Compensation Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based Compensation Expense	260	252
Nonvested Stock Awards and Restricted Stock Unit Compensation Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based Compensation Expense	698	775
Employee Stock Purchase Plan Compensation Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based Compensation Expense	23	22
Directors Stock Ownership Plan Compensation Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based Compensation Expense	$ 31	$ 34

Share-Based Compensation - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) shares
Share Based Compensation [Abstract]
Option Award Vesting Period	3 years
Employee Stock Option [Member]
Share Based Compensation [Line Items]
Unrecognized Share-Based Compensation Expense, Stock Option Awards	$ 1.0
Weighted Average Remaining Life, Nonvested Stock Awards	1 year 7 months 6 days
Restricted Stock [Member]
Share Based Compensation [Line Items]
Unrecognized Share-based Compensation Expense, Nonvested Stock Award	$ 1.7
Weighted Average Remaining Life, Nonvested Stock Awards	1 year 7 months 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period \| shares	232
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 8 months 12 days

Pension and Postretirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan description of nature of event resulting in contractual termination benefits to be recognized in future period	The Company previously disclosed in its Annual Report filed on Form 10-K for the year ended December 31, 2018 that the Company began the process of terminating the Company’s primary non-contributory U.S. pension plan (the “U.S. Pension Plan”) during the fourth quarter of 2018. As part of this process, and considering the fully funded status of the U.S. Pension Plan, the asset allocation of the U.S. Pension Plan was adjusted modeling a glide path that is more heavily allocated to fixed income securities with lengthened durations to match the projected liabilities. As a result, the expected return on plan assets declined during the three months ended March 31, 2019 compared to the three months ended March 31, 2018. In order to terminate the U.S. Pension Plan in accordance with IRS and Pension Benefit Guaranty Corporation requirements, the Company will be required to fully fund the U.S. Pension Plan on a termination basis and will commit to contribute additional assets if necessary, 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 related 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 the U.S. Pension Plan was approximately $19 million as of March 31, 2019. The Company currently estimates that the U.S. Pension Plan termination will be completed during 2020.
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	$ 986	$ 988
Defined Benefit Plan, Interest Cost	1,111	1,049
Defined Benefit Plan, Expected Return on Plan Assets	(984)	(1,290)
Defined Benefit Plan, Amortization of Losses	775	800
Defined Benefit Plan, Amortization of Prior Service Cost	(42)	(31)
Defined Benefit Plan, Net Periodic Benefit Cost	1,846	1,516
Defined Benefit Plan, Contributions by Employer	2,900
Pension Plans, Defined Benefit [Member] \| 2019 Year [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Contributions In Current Fiscal Year	5,200
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	2	2
Defined Benefit Plan, Interest Cost	35	33
Defined Benefit Plan, Expected Return on Plan Assets	0	0
Defined Benefit Plan, Amortization of Losses	0	15
Defined Benefit Plan, Amortization of Prior Service Cost	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	37	$ 50
Defined Benefit Plan, Contributions by Employer	200
Other Postretirement Benefit Plans, Defined Benefit [Member] \| 2019 Year [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Contributions In Current Fiscal Year	$ 400

Other Income (Expense) - (Details) - USD ($) $ in Thousands	3 Months Ended
Other Income (Expense) - (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Other Income And Expenses [Abstract]
Income From Third Party License Fees	$ 220	$ 250
Foreign Exchange (Losses) Gains, Net	(237)	(229)
Gain (loss) on Fixed Asset Disposals, Net	9	52
Non-Income Tax Refunds and Other Related Credits	152	36
Pension and Post Retirement Benefit Costs Non-service Components	(896)	(576)
Other Nonoperating Income	148	157
Other Nonoperating Expense	(31)	(59)
Other (Expense) Income, Net	$ (635)	$ (369)

Income Taxes and Uncertain Tax Positions (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Effective Income Tax Rate, Continuing Operations	26.80%	29.80%
Unrecognized Tax Benefits	$ 7.7		$ 7.1
Unrecognized Tax Benefits, Interest on Income Taxes Expense	0.1	$ 0.1
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	0.7		0.6
Unrecognized Tax Benefits, Income Tax Penalties Accrued	0.8		$ 0.8
Unrecognized Tax Benefits, Income Tax Penalties Expense	0.1	0.1
Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations	0.1	$ 0.1
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items]
Decrease In Unrecognized Tax Benefits Is Reasonably Possible	$ 1.0
Income Tax Examination [Line Items]
Statutory Tax Rate	25.00%	15.00%
US Tax Reform Act	As previously disclosed in its Annual Report filed on Form 10-K for the year ended December 31, 2018, the Company recognized a deferred tax liability of $7.9 million in the fourth quarter of 2018 related to the Company’s estimate of non-U.S. taxes it will incur to repatriate certain foreign earnings. The Company incurred tax payments related to the repatriation of a portion of these foreign earnings during the first quarter of 2019 and reduced this deferred tax liability by approximately $3.2 million.
Italy [Member]
Income Tax Examination [Line Items]
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 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.
Internal Revenue Service (IRS) [Member]
Income Tax Examination [Line Items]
Income Tax Examination Year Under Examination	2015
Foreign Tax Authority [Member] \| The Netherlands [Member]
Income Tax Examination [Line Items]
Income Tax Examination Year Under Examination	2013
Foreign Tax Authority [Member] \| United Kingdom [Member]
Income Tax Examination [Line Items]
Income Tax Examination Year Under Examination	2013
Foreign Tax Authority [Member] \| Brazil [Member]
Income Tax Examination [Line Items]
Income Tax Examination Year Under Examination	2000
Foreign Tax Authority [Member] \| Spain [Member]
Income Tax Examination [Line Items]
Income Tax Examination Year Under Examination	2014
Foreign Tax Authority [Member] \| China [Member]
Income Tax Examination [Line Items]
Income Tax Examination Year Under Examination	2014
Foreign Tax Authority [Member] \| Italy [Member]
Income Tax Examination [Line Items]
Income Tax Examination Year Under Examination	2007
Foreign Tax Authority [Member] \| India [Member]
Income Tax Examination [Line Items]
Income Tax Examination Year Under Examination	2017
Foreign Tax Authority [Member] \| Mexico [Member]
Income Tax Examination [Line Items]
Income Tax Examination Year Under Examination	2014
State and Local Jurisdiction [Member]
Income Tax Examination [Line Items]
Income Tax Examination Year Under Examination	2009

Earnings Per Share - Basic (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net Income Attributable to Quaker Chemical Corporation	$ 13,844	$ 12,732
Less: Income Allocated to Participating Securities	(46)	(62)
Net Income Available to Common Shareholders	$ 13,798	$ 12,670
Basic Weighted Average Common Shares Outstanding	13,291,589	13,245,026
Basic Earnings Per Common Share	$ 1.04	$ 0.96

- Definition

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

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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
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net Income Attributable to Quaker Chemical Corporation	$ 13,844	$ 12,732
Less: Income Allocated to Participating Securities	(46)	(62)
Net Income Available to Common Shareholders	$ 13,798	$ 12,670
Basic Weighted Average Common Shares Outstanding	13,291,589	13,245,026
Effect of Dilutive Securities	46,901	33,580
Diluted Weighted Average Common Shares Outstanding	13,338,490	13,278,606
Diluted Earnings per Common Share	$ 1.03	$ 0.95

- 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.

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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1337-109256

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(21))
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 60B
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109260490&loc=SL5780133-109256

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(19))
-URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263

+ 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	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	2,862

Restricted Cash (Details) - USD ($) $ in Thousands	3 Months Ended
Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	$ 71,960	$ 104,147	$ 92,581	$ 89,879
Restricted Cash Included in Other Assets	20,153	20,278	21,105	21,171
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents	$ 92,113	$ 124,425	$ 113,686	$ 111,050
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 $0.1 million and less than $0.1 million in the three months ended March 31, 2019 and 2018, respectively, offset by $0.2 million and less than $0.1 million of net payments during the three months ended March 31, 2019 and 2018 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.

Goodwill Assets (Details) $ in Thousands	3 Months Ended
Goodwill Assets (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 83,333
Goodwill, Translation Adjustments	(129)
Goodwill, Ending Balance	83,204
North America [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	47,303
Goodwill, Translation Adjustments	82
Goodwill, Ending Balance	47,385
EMEA [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	19,335
Goodwill, Translation Adjustments	(414)
Goodwill, Ending Balance	18,921
Asia Pacific [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	14,587
Goodwill, Translation Adjustments	232
Goodwill, Ending Balance	14,819
South America [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	2,108
Goodwill, Translation Adjustments	(29)
Goodwill, Ending Balance	$ 2,079

Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets, Gross [Abstract]
Finite-Lived Customer Lists, Gross	$ 74,574	$ 74,989
Trademarks, Formulations And Product Technology, Gross	33,128	33,275
Other Finite-Lived Intangible Assets, Gross	5,826	5,840
Total	113,528	114,104
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	53,207	51,622
Customer Lists [Member]
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	30,565	29,587
Trademarks, Formulations And Product Technology [Member]
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	17,011	16,469
Other Intangible Assets [Member]
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	$ 5,631	$ 5,566

Intangible Assets - Amortization (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization	$ 1,812	$ 1,853

Intangible Assets - Future Amortization (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
For the year ended December 31, 2019	$ 7,148
For the year ended December 31, 2020	6,841
For the year ended December 31, 2021	6,491
For the year ended December 31, 2022	6,337
For the year ended December 31, 2023	6,120
For the year ended December 31, 2024	$ 5,694

Intangible Assets - Finite Lived (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Indefinite-Lived Trademarks	$ 1.1	$ 1.1

Debt - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
Debt - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Other Long Term Debt	$ 12.4	$ 12.6
Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility Current Borrowing Capacity	300.0
Line of Credit Facility Maximum Borrowing Capacity	$ 400.0
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.
Line of Credit Facility, Covenant Compliance	As of March 31, 2019 and December 31, 2018, the Company’s 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, Amount Outstanding	$ 0.0	$ 24.0
Debt Instrument Maturity Date Description	During the first quarter of 2019, the Credit Facility was amended and restated to extend the maturity date to July 15, 2020.

- 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

Equity and Noncontrolling Interest (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019	Jan. 01, 2018
Beginning Balance	$ 436,369	$ 409,618
Cumulative effect of accounting change			$ (44)	$ (754)
Adjusted beginning balance			436,325	408,864
Net Income	13,900	12,787
Amounts reported in other comprehensive income (loss)	1,547	6,457
Dividends, Common Stock	(4,933)	(4,729)
Distributions to Noncontrolling Affiliate Shareholders	0	(834)
Share Issuance and Equity-Based Compensation Plans	(476)	218
Ending Balance	446,363	422,763
Common Stock [Member]
Beginning Balance	13,338	13,308
Cumulative effect of accounting change			0	0
Adjusted beginning balance			13,338	13,308
Net Income	0	0
Amounts reported in other comprehensive income (loss)	0	0
Dividends, Common Stock	0	0
Distributions to Noncontrolling Affiliate Shareholders	0	0
Share Issuance and Equity-Based Compensation Plans	(4)	15
Ending Balance	13,334	13,323
Additional Paid-in Capital [Member]
Beginning Balance	97,304	93,528
Cumulative effect of accounting change			0	0
Adjusted beginning balance			97,304	93,528
Net Income	0	0
Amounts reported in other comprehensive income (loss)	0	0
Dividends, Common Stock	0	0
Distributions to Noncontrolling Affiliate Shareholders	0	0
Share Issuance and Equity-Based Compensation Plans	(472)	203
Ending Balance	96,832	93,731
Retained Earnings [Member]
Beginning Balance	405,125	365,936
Cumulative effect of accounting change			(44)	(754)
Adjusted beginning balance			405,081	365,182
Net Income	13,844	12,732
Amounts reported in other comprehensive income (loss)	0	0
Dividends, Common Stock	(4,933)	(4,729)
Distributions to Noncontrolling Affiliate Shareholders	0	0
Share Issuance and Equity-Based Compensation Plans	0	0
Ending Balance	413,992	373,185
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance	(80,715)	(65,100)
Cumulative effect of accounting change			0	0
Adjusted beginning balance			(80,715)	(65,100)
Net Income	0	0
Amounts reported in other comprehensive income (loss)	1,548	6,362
Dividends, Common Stock	0	0
Distributions to Noncontrolling Affiliate Shareholders	0	0
Share Issuance and Equity-Based Compensation Plans	0	0
Ending Balance	(79,167)	(58,738)
Noncontrolling Interest [Member]
Beginning Balance	1,317	1,946
Cumulative effect of accounting change			0	0
Adjusted beginning balance			$ 1,317	$ 1,946
Net Income	56	55
Amounts reported in other comprehensive income (loss)	(1)	95
Dividends, Common Stock	0	0
Distributions to Noncontrolling Affiliate Shareholders	0	(834)
Share Issuance and Equity-Based Compensation Plans	0	0
Ending Balance	$ 1,372	$ 1,262

Equity and Noncontrolling Interest - Parentheticals (Details) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Stockholders Equity [Abstract]
Dividends Declared	$ 0.37	$ 0.355

Equity and Noncontrolling Interest - Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Loss, Balance at Beginning of Period	$ (80,715)	$ (65,100)
Other Comprehensive Income (Loss) Before Reclassifications	1,436	5,624
Amounts Reclassified from AOCI	637	611
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	2,073	6,235
Related Tax Amounts	(525)	127
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	1,548	6,362
Accumulated Other Comprehensive Loss, Balance at End of Period	(79,167)	(58,738)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Loss, Balance at Beginning of Period	(49,322)	(31,893)
Other Comprehensive Income (Loss) Before Reclassifications	(431)	6,764
Amounts Reclassified from AOCI	0	0
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	(431)	6,764
Related Tax Amounts	0	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(431)	6,764
Accumulated Other Comprehensive Loss, Balance at End of Period	(49,753)	(25,129)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Loss, Balance at Beginning of Period	(30,551)	(34,093)
Other Comprehensive Income (Loss) Before Reclassifications	160	(697)
Amounts Reclassified from AOCI	733	783
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	893	86
Related Tax Amounts	(187)	(2)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	706	84
Accumulated Other Comprehensive Loss, Balance at End of Period	(29,845)	(34,009)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Loss, Balance at Beginning of Period	(842)	886
Other Comprehensive Income (Loss) Before Reclassifications	1,707	(443)
Amounts Reclassified from AOCI	(96)	(172)
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	1,611	(615)
Related Tax Amounts	(338)	129
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	1,273	(486)
Accumulated Other Comprehensive Loss, Balance at End of Period	$ 431	$ 400

Business Acquisitions - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Business Acquisition [Line Items]
Cash Paid for Acquisitions	$ 500	$ 500
Goodwill	83,204		$ 83,333
Business Combination Transaction-Related Expenses	5,300	6,100
Other current liabilities	39,743		$ 32,319
Mining North America [Member]
Business Acquisition [Line Items]
Cash Paid for Acquisitions	$ 500	500
Mining North America [Member] \| Trademarks, Formulations and Product Technology [Member]
Business Acquisition [Line Items]
Intangibles		$ 1,000
Intangible Assets, Amortizable Life		10 years

Fair Value Measurements - Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Company Owned Life Insurance	$ 1,635	$ 1,491
Assets, Fair Value Disclosure	1,635	1,491
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	1,635	1,491
Assets, Fair Value Disclosure	1,635	1,491
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 (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Loss Contingency Accrual At Carrying Value	$ 0.2	$ 0.2
ACP [Member] \| Maximum [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	1.0
ACP [Member] \| Minimum [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	0.1
SB Decking [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 1.7