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EQUITY-BASED COMPENSATION (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Manager      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) 25,998    
Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) 1,684,318    
Stock options | Manager      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) 1,684,318 129,988 1,262,362
Restricted shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares other than options granted in period (in shares) 662,423 545,806 113,121
Grant date fair value $ 5.6 $ 4.0 $ 1.5
Vesting period 3 years    
Common units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares other than options granted in period (in shares) 1,052,632 831,140 1,110,000
Shares other than options granted aggregate intrinsic value $ 1.2 $ 0.9 $ 3.4
Award term 3 years    
Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized (in shares) 29,800,000