Earnings Per Share - Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net Income Attributable to Quaker Chemical Corporation	$ 19,246	$ 11,906	$ 31,978	$ 18,898
Less: Income Allocated to Participating Securities	(83)	(82)	(147)	(145)
Net Income Available to Common Shareholders	$ 19,163	$ 11,824	$ 31,831	$ 18,753
Basic Weighted Average Common Shares Outstanding	13,267,504	13,195,053	13,256,327	13,185,627
Effect of Dilutive Securities	29,884	45,226	31,619	45,310
Diluted Weighted Average Common Shares Outstanding	13,297,388	13,240,279	13,287,946	13,230,937
Diluted Earnings per Common Share	$ 1.44	$ 0.89	$ 2.4	$ 1.42