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INVESTMENT IN EQUITY SECURITIES - Narrative (Details) € in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 07, 2021 USD ($) | Apr. 01, 2020 USD ($) | Jan. 01, 2020 USD ($) | Nov. 30, 2020 USD ($) | Aug. 31, 2019 USD ($) investment | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2009 EUR (€) | Mar. 31, 2021
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in unconsolidated affiliate |  |  |  |  |  |  |  | $ 0 | $ 34,044,000 |  |  |  |
Investment impairment |  |  |  |  |  |  |  | 0 |  |  |  |  |
BTY |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage of equity method investment |  |  | 49.00% |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  | $ 33,005,000 | $ 33,020,000 | 33,005,000 |  | $ 33,020,000 |  |  |
Initial lock-up period (in years) |  |  | 5 years |  |  |  |  |  |  |  |  |  |
Second lock-up period (in years) |  |  | 3 years |  |  |  |  |  |  |  |  |  |
Investment in unconsolidated affiliate |  |  | $ 32,000,000 |  |  |  |  |  |  |  |  |  |
BTY | Call Option | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage of equity method investment |  |  | 26.00% |  |  |  |  |  |  |  |  |  |
BTY | Call Option | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage of equity method investment |  |  | 31.00% |  |  |  |  |  |  |  |  |  |
Sonmol |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage of equity method investment |  | 30.00% |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  | 5,710,000 | 5,598,000 | 5,710,000 |  | 5,598,000 |  |  |
Investment in unconsolidated affiliate |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |
Kali Care |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage of equity method investment |  |  |  |  |  |  |  |  |  |  | 20.00% |  |
Equity method investments |  |  |  |  |  | 422,000 | 535,000 | 422,000 |  | 535,000 |  |  |
Investment in unconsolidated affiliate |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  |
Investment impairment |  |  |  |  |  |  | 3,000,000.0 |  |  |  |  |  |
Investment impairment, net |  |  |  |  |  |  | 2,300,000 |  |  |  |  |  |
Desotec GmbH |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage of equity method investment |  |  |  |  |  |  |  |  |  |  |  | 23.00% |
Equity method investments |  |  |  |  |  | 943,000 | $ 964,000 | 943,000 |  | 964,000 |  |  |
Investment in unconsolidated affiliate | € |  |  |  |  |  |  |  |  |  |  |  | € 574 |
Loop and Purecycle | Preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |
YAT | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in unconsolidated affiliate | $ 5,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Investment ownership percentage | 0.10 |  |  |  |  |  |  |  |  |  |  |  |
Purecycle |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  | 0.01
Unrealized gain (loss) on investments |  |  |  |  |  | $ (1,600,000) |  | $ 15,200,000 |  |  |  |  |
Purecycle | Preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity received in exchange for services |  |  |  |  |  |  |  |  |  | $ 333,000 |  |  |
Increase (decrease) in value of preferred equity stock investment |  |  |  | $ 3,100,000 |  |  |  |  |  |  |  |  |

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