Earnings Per Share - Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net Income Attributable to Quaker Chemical Corporation	$ 19,690	$ 11,142	$ 51,668	$ 30,040
Less: Income Allocated to Participating Securities	(77)	(76)	(226)	(222)
Net Income Available to Common Shareholders	$ 19,613	$ 11,066	$ 51,442	$ 29,818
Basic Weighted Average Common Shares Outstanding	13,278,259	13,217,165	13,263,417	13,196,255
Effect of Dilutive Securities	37,282	34,528	33,928	41,818
Diluted Weighted Average Common Shares Outstanding	13,315,541	13,251,693	13,297,345	13,238,073
Diluted Earnings per Common Share	$ 1.47	$ 0.83	$ 3.87	$ 2.25