Condensed Consolidated Statement of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Net sales	$ 205,869	$ 221,962	$ 417,079	$ 434,017
Cost of goods sold	130,708	141,025	266,151	277,633
Gross profit	75,161	80,937	150,928	156,384
Selling, general and administrative expenses	50,026	54,083	101,481	104,090
Combination and other acquisition-related expenses	4,604	4,291	9,087	9,500
Operating income	20,531	22,563	40,360	42,794
Other income (expense), net	43	261	(592)	(108)
Interest Expense	(1,283)	(1,602)	(2,497)	(3,294)
Interest Income	550	571	988	1,060
Income Before Taxes and Equity in Net Income of Associated Companies	19,841	21,793	38,259	40,452
Taxes on income before equity in net income of associated companies	4,800	3,668	9,729	9,224
Income before equity in net income of associated companies	15,041	18,125	28,530	31,228
Equity in net income of associated companies	608	1,245	1,019	929
Net income	15,649	19,370	29,549	32,157
Less: Net income attributable to noncontrolling interest	58	124	114	179
Net income attributable to Quaker Chemical Corporation	$ 15,591	$ 19,246	$ 29,435	$ 31,978
Per share data:
Basic Earnings Per Common Share	$ 1.17	$ 1.44	$ 2.21	$ 2.40
Diluted Earnings per Common Share	1.17	1.44	2.20	2.40
Dividends Declared	$ 0.385	$ 0.370	$ 0.755	$ 0.725