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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 |  |  |  |

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