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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Contingent Purchase Obligation (Details) - Contingent Consideration - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance   $ 0
Purchase   2,745
Net realized / unrealized losses $ 1,135 1,135
Ending balance $ 3,880 $ 3,880