CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total Kraton Stockholders' Equity	Noncontrolling Interest
Beginning balance at Dec. 31, 2017	$ 666,519	$ 316	$ 377,957	$ 356,503	$ (98,295)	$ 636,481	$ 30,038
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Consolidated net income (loss)	22,061			22,072		22,072	(11)
Other comprehensive loss	5,046				4,513	4,513	533
Retired treasury stock from employee tax withholdings	(5,748)	(1)	(3,020)	(2,727)		(5,748)
Exercise of stock options	1,368	1	1,367			1,368
Non-cash compensation related to equity awards	2,902	3	2,899			2,902
Ending balance at Mar. 31, 2018	692,148	319	379,203	375,848	(93,782)	661,588	30,560
Beginning balance at Dec. 31, 2018	747,599	319	385,921	420,597	(91,699)	715,138	32,461
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Consolidated net income (loss)	13,612			12,668		12,668	944
Other comprehensive loss	(1,327)				(1,218)	(1,218)	(109)
Retired treasury stock from employee tax withholdings	(2,684)		(1,274)	(1,410)		(2,684)
Exercise of stock options	1,545	1	1,544			1,545
Non-cash compensation related to equity awards	3,309		3,309			3,309
Ending balance at Mar. 31, 2019	$ 762,054	$ 320	$ 389,500	$ 431,855	$ (92,917)	$ 728,758	$ 33,296