CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Consolidated net income (loss)	$ 175,590,000	$ (221,686,000)	$ 55,817,000
Adjustments to reconcile consolidated net income (loss) to net cash provided by operating activities:
Depreciation and amortization	126,475,000	126,022,000	136,171,000
Lease amortization	24,208,000	24,488,000	23,093,000
Amortization of debt premium and original issue discount	0	148,000	1,064,000
Amortization of debt issuance costs	2,535,000	3,045,000	4,654,000
Amortization of deferred income	(27,474,000)	(20,054,000)	0
Loss on disposal of property, plant, and equipment	879,000	750,000	773,000
Disposition and exit of business activities	149,000	(175,189,000)	0
Loss on extinguishment of debt	0	40,843,000	3,521,000
Impairment of goodwill	0	400,000,000	0
(Earnings) loss from unconsolidated joint venture, net of dividends received	6,000	50,000	(62,000)
Deferred income tax benefit	(3,553,000)	(56,114,000)	(159,000)
Release of uncertain tax positions	0	(2,445,000)	(18,309,000)
Gain on insurance proceeds for capital expenditures	0	0	(3,948,000)
Share-based compensation	11,342,000	11,361,000	9,493,000
Decrease (increase) in:
Accounts receivable	(57,762,000)	(563,000)	5,848,000
Inventories of products, materials, and supplies	(133,463,000)	18,234,000	46,533,000
Other assets	(10,931,000)	483,000	10,986,000
Increase (decrease) in:
Accounts payable-trade	76,782,000	352,000	(3,472,000)
Other payables and accruals	1,187,000	5,595,000	(20,018,000)
Other long-term liabilities	(16,196,000)	(2,900,000)	(13,401,000)
Due to related party	1,451,000	(1,089,000)	(3,644,000)
Net cash provided by operating activities	171,225,000	151,331,000	234,940,000
CASH FLOWS FROM INVESTING ACTIVITIES
Kraton purchase of property, plant, and equipment	(90,454,000)	(73,893,000)	(103,688,000)
KFPC purchase of property, plant, and equipment	(365,000)	(4,132,000)	(965,000)
Purchase of software and other intangibles	(10,395,000)	(7,943,000)	(8,019,000)
Insurance proceeds for capital expenditures	0	0	3,948,000
Cash proceeds (payments) from disposition and exit of business activities	(5,802,000)	510,500,000	0
Net cash provided by (used in) investing activities	(107,016,000)	424,532,000	(108,724,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from debt	107,500,000	477,000,000	57,941,000
Repayments of debt	(107,500,000)	(967,967,000)	(198,053,000)
KFPC proceeds from debt	62,407,000	71,949,000	34,240,000
KFPC repayments of debt	(85,633,000)	(90,577,000)	(59,700,000)
Finance lease payments	(1,029,000)	(179,000)	(169,000)
Purchase of treasury stock	(4,946,000)	(847,000)	(12,821,000)
Proceeds from the exercise of stock options	6,399,000	78,000	2,424,000
Settlement of interest rate swap	0	(1,295,000)	0
Distribution to non-controlling interest	(102,000)	0	0
Debt issuance costs	0	(9,095,000)	0
Net cash used in financing activities	(22,904,000)	(520,933,000)	(176,138,000)
Effect of exchange rate differences on cash	3,313,000	(4,062,000)	(936,000)
Net increase (decrease) in cash and cash equivalents	44,618,000	50,868,000	(50,858,000)
Cash and cash equivalents, beginning of period	85,901,000	35,033,000	85,891,000
Cash and cash equivalents, end of period	130,519,000	85,901,000	35,033,000
Supplemental disclosures during the period:
Cash paid for income taxes, net of refunds received	26,326,000	6,917,000	7,804,000
Cash paid for interest, net of capitalized interest	36,948,000	66,757,000	56,407,000
Capitalized interest	3,429,000	3,099,000	3,625,000
Supplemental non-cash disclosures increase (decrease) during the period:
Property, plant, and equipment accruals	3,551,000	(9,785,000)	2,277,000
Operating leases	$ 34,141,000	$ 19,928,000	$ 105,308,000