SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ / shares in Units, shares in Thousands	1 Months Ended			3 Months Ended	12 Months Ended
	Nov. 30, 2020 USD ($)	Aug. 31, 2019 USD ($) investment	Jan. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	May 31, 2018 USD ($)
ACCOUNTS RECEIVABLE AND CURRENT EXPECTED CREDIT LOSSES
Accounts receivable				$ 567,000,000	$ 567,000,000
Accounts and notes receivable, less current expected credit loss (in dollars)				$ 5,918,000	5,918,000	$ 3,626,000
INVESTMENTS IN EQUITY SECURITIES
Increase (decrease) in value of preferred equity stock investment					64,000	0	$ 6,500,000
Proceeds from sale of investment in equity securities					0	16,487,000	0
Investment in unconsolidated affiliate					39,628,000	3,530,000	10,000,000
Dividends received from affiliates					$ 0	$ 0	0
RETIREMENT OF COMMON STOCK
Common stock repurchased (retired and held in treasury) (in shares) | shares					0	779
Common stock, par value (in dollars per share) | $ / shares				$ 0.01	$ 0.01	$ 0.01
RESEARCH & DEVELOPMENT EXPENSES
Research and development expenses incurred net of customer funded research and development or government research and development credits					$ 92,500,000	$ 82,800,000	75,300,000
TRANSLATION OF FOREIGN CURRENCIES
Foreign Currency Transaction Gain (Loss), before Tax					(5,900,000)	$ (1,700,000)	(1,700,000)
PureCycle
INVESTMENTS IN EQUITY SECURITIES
Investment impairment					0
Kali Care
INVESTMENTS IN EQUITY SECURITIES
Investment in unconsolidated affiliate								$ 5,000,000
Investment impairment				$ 3,000,000.0
Preferred equity stocks
INVESTMENTS IN EQUITY SECURITIES
Investment in preferred equity stock									$ 10,000,000.0
Increase (decrease) in value of preferred equity stock investment							$ 6,500,000
Proceeds from sale of investment in equity securities			$ 16,500,000
Preferred equity stocks | Loop and Purecycle
INVESTMENTS IN EQUITY SECURITIES
Increase (decrease) in value of preferred equity stock investment					1,400,000
Investment in unconsolidated affiliate		$ 3,500,000
Number of preferred equity investments | investment		2
Preferred equity stocks | PureCycle
INVESTMENTS IN EQUITY SECURITIES
Increase (decrease) in value of preferred equity stock investment	$ 3,100,000
Equity received in exchange for services					$ 333,000
Buildings and improvements | Minimum
PROPERTY AND DEPRECIATION
Estimated useful lives (in years)					10 years
Buildings and improvements | Maximum
PROPERTY AND DEPRECIATION
Estimated useful lives (in years)					40 years
Machinery and equipment | Minimum
PROPERTY AND DEPRECIATION
Estimated useful lives (in years)					3 years
Machinery and equipment | Maximum
PROPERTY AND DEPRECIATION
Estimated useful lives (in years)					15 years
Finite-Lived Intangible Assets | Minimum
FINITE-LIVED INTANGIBLE ASSETS
Finite-Lived Intangible Asset, Useful Life (in years)					1 year
Finite-Lived Intangible Assets | Maximum
FINITE-LIVED INTANGIBLE ASSETS
Finite-Lived Intangible Asset, Useful Life (in years)					20 years