CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenue	$ 456,411	$ 502,392
Cost of goods sold	349,409	355,314
Gross profit	107,002	147,078
Operating expenses:
Research and development	10,551	10,797
Selling, general, and administrative	40,894	38,723
Depreciation and amortization	31,522	35,376
Gain on insurance proceeds	(11,100)	0
Loss on disposal of fixed assets	0	27
Operating income	35,135	62,155
Other expense	(259)	(1,113)
Gain (loss) on extinguishment of debt	210	(7,591)
Earnings of unconsolidated joint venture	121	137
Interest expense, net	(18,941)	(29,276)
Income before income taxes	16,266	24,312
Income tax expense	(2,654)	(2,251)
Consolidated net income	13,612	22,061
Net (income) loss attributable to noncontrolling interest	(944)	11
Net income attributable to Kraton	$ 12,668	$ 22,072
Earnings per common share:
Basic (in dollars per share)	$ 0.40	$ 0.69
Diluted (in dollars per share)	$ 0.39	$ 0.68
Weighted average common shares outstanding:
Basic (in shares)	31,633	31,241
Diluted (in share)	31,901	31,851