Earnings Per Share - Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net Income Attributable to Quaker Chemical Corporation	$ 15,591	$ 19,246	$ 29,435	$ 31,978
Less: Income Allocated to Participating Securities	(34)	(83)	(81)	(147)
Net Income Available to Common Shareholders	$ 15,557	$ 19,163	$ 29,354	$ 31,831
Basic Weighted Average Common Shares Outstanding	13,304,248	13,267,504	13,297,953	13,256,327
Effect of Dilutive Securities	48,007	29,884	47,362	31,619
Diluted Weighted Average Common Shares Outstanding	13,352,255	13,297,388	13,345,315	13,287,946
Diluted Earnings per Common Share	$ 1.17	$ 1.44	$ 2.20	$ 2.40