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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