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EQUITY-BASED COMPENSATION - Restricted stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
EQUITY-BASED COMPENSATION        
Payments for repurchase of common stock     $ 1,206 $ 10,876
Restricted Stock        
EQUITY-BASED COMPENSATION        
Compensation expense $ 2,400 $ 2,100 $ 5,400 $ 5,800
Restricted Stock | Minimum        
EQUITY-BASED COMPENSATION        
offering period     1 year  
Restricted Stock | Maximum        
EQUITY-BASED COMPENSATION        
offering period     3 years  
Restricted Stock Awards        
EQUITY-BASED COMPENSATION        
Unrecognized compensation expense $ 13,200   $ 13,200  
Weighted-average remaining life     1 year 10 months 24 days  
Restricted stock        
Beginning balance (in shares)     2,003,072  
Granted (in shares)     2,154,897  
Vested (in shares)     (693,582)  
Forfeited (in shares)     (319,874)  
Ending balance (in shares) 3,144,513   3,144,513  
Grant Date Fair Value        
Beginning balance (in dollars per share)     $ 6.97  
Granted (in dollars per share)     7.02  
Vested (in dollars per share)     7.92  
Forfeited (in dollars per share)     6.41  
Ending balance (in dollars per share) $ 6.85   $ 6.85