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FAIR VALUE - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Fair Value Disclosures [Abstract]        
Changes in valuation inputs or changes in assumptions   $ 0   $ 0
Unobservable inputs reconciliation, transfers   0 $ 0  
Embedded Derivative [Line Items]        
Realized and unrealized gain (loss) on embedded derivative $ 9,400,000 9,400,000    
Other Assets        
Embedded Derivative [Line Items]        
Embedded derivative, fair value $ 10,700,000 $ 10,700,000