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INVESTMENT IN EQUITY SECURITIES - Narrative (Details) € in Thousands |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 48 Months Ended
--- | --- | --- | --- | --- | --- | ---
Apr. 01, 2020 USD ($) | Jan. 01, 2020 USD ($) | Nov. 30, 2020 USD ($) | Aug. 31, 2019 USD ($) investment | Dec. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2009 EUR (€) | Dec. 31, 2020 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment in unconsolidated affiliate |  |  |  |  |  | $ 39,628,000 | $ 3,530,000 | $ 10,000,000 |  |  |
Income (Loss) from equity method investment |  |  |  |  |  | (1,443,000) | 135,000 | (229,000) |  |  |
Increase (decrease) in value of preferred equity stock investment |  |  |  |  |  | 64,000 | 0 | 6,500,000 |  |  |
Preferred equity stocks |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in value of preferred equity stock investment |  |  |  |  |  |  |  | $ 6,500,000 |  |  |
Sonmol |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment in unconsolidated affiliate | $ 5,000,000 |  |  |  |  |  |  |  |  |  |
Ownership percentage of equity method investment | 30.00% |  |  |  |  |  |  |  |  |  |
Equity method investments value |  |  |  |  | $ 5,598,000 | 5,598,000 | 0 |  |  |  | $ 5,598,000
BTY |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment in unconsolidated affiliate |  | $ 32,000,000 |  |  |  |  |  |  |  |  |
Ownership percentage of equity method investment |  | 49.00% |  |  |  |  |  |  |  |  |
Equity method investments value |  |  |  |  | 33,020,000 | 33,020,000 | 119,000 |  |  |  | 33,020,000
Initial lock-up period (in years) |  | 5 years |  |  |  |  |  |  |  |  |
Second lock-up period (in years) |  | 3 years |  |  |  |  |  |  |  |  |
BTY | Minimum | Call Option |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage of equity method investment |  | 26.00% |  |  |  |  |  |  |  |  |
BTY | Maximum | Call Option |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage of equity method investment |  | 31.00% |  |  |  |  |  |  |  |  |
Kali Care |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment in unconsolidated affiliate |  |  |  |  |  |  |  |  | $ 5,000,000 |  |
Ownership percentage of equity method investment |  |  |  |  |  |  |  |  | 20.00% |  |
Equity method investments value |  |  |  |  | 535,000 | 535,000 | 3,881,000 |  |  |  | 535,000
Income (Loss) from equity method investment |  |  |  |  |  |  |  |  |  |  | (1,500,000)
Investment impairment |  |  |  |  | 3,000,000.0 |  |  |  |  |  |
Investment impairment, net |  |  |  |  | 2,300,000 |  |  |  |  |  |
Desotec GmbH |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment in unconsolidated affiliate | € |  |  |  |  |  |  |  |  |  | € 574 |
Ownership percentage of equity method investment |  |  |  |  |  |  |  |  |  | 23.00% |
Equity method investments value |  |  |  |  | $ 964,000 | 964,000 | $ 858,000 |  |  |  | $ 964,000
Loop and Purecycle | Preferred equity stocks |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment in unconsolidated affiliate |  |  |  | $ 3,500,000 |  |  |  |  |  |  |
Number of preferred equity investments | investment |  |  |  | 2 |  |  |  |  |  |  |
Increase (decrease) in value of preferred equity stock investment |  |  |  |  |  | 1,400,000 |  |  |  |  |
PureCycle |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment impairment |  |  |  |  |  | 0 |  |  |  |  |
PureCycle | Preferred equity stocks |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in value of preferred equity stock investment |  |  | $ 3,100,000 |  |  |  |  |  |  |  |
Equity received in exchange for services |  |  |  |  |  | $ 333,000 |  |  |  |  |

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