Earnings Per Share - Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net Income Attributable to Quaker Chemical Corporation	$ 13,844	$ 12,732
Less: Income Allocated to Participating Securities	(46)	(62)
Net Income Available to Common Shareholders	$ 13,798	$ 12,670
Basic Weighted Average Common Shares Outstanding	13,291,589	13,245,026
Effect of Dilutive Securities	46,901	33,580
Diluted Weighted Average Common Shares Outstanding	13,338,490	13,278,606
Diluted Earnings per Common Share	$ 1.03	$ 0.95