CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income attributable to Kraton	$ 12,668	$ 22,072
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax of $0	(4,496)	3,619
Unrealized gain (loss) on cash flow hedges, net of tax benefit of $387 and expense of $867, respectively	(1,316)	2,893
Reclassification of gain on cash flow hedge, net of tax expense of $588	0	(1,999)
Unrealized gain on net investment hedge, net of tax expense of $1,352	4,594	0
Other comprehensive income (loss), net of tax	(1,218)	4,513
Comprehensive income attributable to Kraton	11,450	26,585
Comprehensive income attributable to noncontrolling interest	835	522
Consolidated comprehensive income	$ 12,285	$ 27,107