Condensed Consolidated Statement of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Net Sales	$ 221,962	$ 201,183	$ 434,017	$ 396,092
Cost of goods sold	141,025	129,348	277,633	253,370
Gross profit	80,937	71,835	156,384	142,722
Selling, general and administrative expenses	54,083	49,594	104,090	97,648
Combination-related expenses	4,291	4,338	9,500	13,413
Operating income	22,563	17,903	42,794	31,661
Other income (expense), net	261	(1,571)	(108)	(1,676)
Interest Expense	1,602	780	3,294	1,436
Interest Income	571	540	1,060	1,063
Income before taxes and equity in net income of associated companies	21,793	16,092	40,452	29,612
Taxes on income before equity in net income of associated companies	3,668	4,224	9,224	11,089
Income before equity in net income of associated companies	18,125	11,868	31,228	18,523
Equity in net income of associated companies	1,245	473	929	1,432
Net Income	19,370	12,341	32,157	19,955
Less: Net income attributable to noncontrolling interest	124	435	179	1,057
Net Income Attributable to Quaker Chemical Corporation	$ 19,246	$ 11,906	$ 31,978	$ 18,898
Per share data:
Basic Earnings Per Common Share	$ 1.44	$ 0.9	$ 2.4	$ 1.42
Diluted Earnings per Common Share	1.44	0.89	2.4	1.42
Dividends Declared	$ 0.37	$ 0.355	$ 0.725	$ 0.7