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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair Value Measurements (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Liabilities subject to fair value measurement:    
Employment agreement award $ 25,597 $ 25,741
Mezzanine equity subject to fair value measurement:    
Redeemable noncontrolling interests 25,116 25,298
Assets subject to fair value measurement:    
Available for sale securities 136,826 136,826
Cash equivalents - money market funds 40,168 39,798
Assets subject to fair value measurement value 176,994 176,624
Level 1    
Assets subject to fair value measurement:    
Cash equivalents - money market funds 40,168 39,798
Assets subject to fair value measurement value 40,168 39,798
Level 3    
Liabilities subject to fair value measurement:    
Employment agreement award 25,597 25,741
Mezzanine equity subject to fair value measurement:    
Redeemable noncontrolling interests 25,116 25,298
Assets subject to fair value measurement:    
Available for sale securities 136,826 136,826
Assets subject to fair value measurement value $ 136,826 $ 136,826