Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Net sales	$ 325,130	$ 222,022	$ 742,209	$ 656,039
Cost of goods sold	220,073	140,929	486,224	418,562
Gross profit	105,057	81,093	255,985	237,477
Selling, general and administrative expenses	80,812	53,270	182,293	157,360
Restructuring and related activities	24,045	0	24,045	0
Combination and other acquisition-related expenses	14,702	2,904	23,789	12,404
Operating (loss) income	(14,502)	24,919	25,858	67,713
Other income (expense), net	203	(523)	(389)	(631)
Interest expense, net	(6,102)	(989)	(7,611)	(3,223)
(Loss) income before taxes and equity in net income of associated companies	(20,401)	23,407	17,858	63,859
Taxes on (loss) income before equity in net income of associated companies	(5,633)	4,330	4,096	13,554
(Loss) income before equity in net income of associated companies	(14,768)	19,077	13,762	50,305
Equity in net income of associated companies	1,787	694	2,806	1,623
Net (loss) income	(12,981)	19,771	16,568	51,928
Less: Net income attributable to noncontrolling interest	72	81	186	260
Net (loss) income attributable to Quaker Chemical Corporation	$ (13,053)	$ 19,690	$ 16,382	$ 51,668
Per share data:
Basic (loss) earnings per common share	$ (0.80)	$ 1.48	$ 1.15	$ 3.88
Diluted (loss) earnings per common share	$ (0.80)	$ 1.47	$ 1.14	$ 3.87