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FAIR VALUE - Roll Forward (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2021
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance at beginning of period $ 31,140
Increase in fair value recorded in earnings 1,950
Balance at end of period $ 33,090