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