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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair value measured on recurring basis (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount 1 $ 0  
Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount 1 0  
Fair Value, Liabilities, Level 3 Transfers, Amount 1 0  
Available-for-Sale Securities    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance, beginning of period 136,826 $ 112,600
Change in fair value included within other comprehensive income   10,400
Balance, end of period 136,826 123,000
Employment Agreement Award    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance, beginning of period 25,741 28,193
Change in fair value (144)  
Change in fair value   579
Balance, end of period 25,597 28,772
Amount of total (losses)/income for the period included in earnings attributable to the change in unrealized losses/income relating to assets and liabilities still held at the reporting date 144 (579)
Redeemable noncontrolling interest    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance, beginning of period 25,298 18,655
Net income attributable to redeemable noncontrolling interests 511 701
Dividends paid to redeemable noncontrolling interests (2,001)  
Change in fair value 1,308  
Change in fair value   871
Balance, end of period $ 25,116 $ 20,227