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EQUITY-BASED COMPENSATION - Restricted stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
EQUITY-BASED COMPENSATION      
Payments for repurchase of common stock $ 10,876 $ 18,600 $ 16,562
Restricted Stock      
EQUITY-BASED COMPENSATION      
Compensation expense 7,200 8,500 $ 4,300
Unrecognized compensation expense 7,200    
Payments for repurchase of common stock $ 1,500 $ 1,000  
Weighted-average remaining life 1 year 8 months 12 days    
Restricted Stock | Minimum      
EQUITY-BASED COMPENSATION      
offering period 1 year    
Restricted Stock | Maximum      
EQUITY-BASED COMPENSATION      
offering period 3 years    
Restricted Stock Awards      
Restricted stock      
Beginning balance (in shares) 1,518,193    
Granted (in shares) 1,477,488    
Vested (in shares) (578,281)    
Forfeited (in shares) (374,299)    
Repurchased (in shares) (40,029)    
Ending balance (in shares) 2,003,072 1,518,193  
Grant Date Fair Value      
Beginning balance (in dollars per share) $ 10.08    
Granted (in dollars per share) 5.80    
Vested (in dollars per share) 11.79    
Forfeited (in dollars per share) 7.43    
Repurchased (in dollars per share) 7.81    
Ending balance (in dollars per share) $ 6.97 $ 10.08  
Restricted Stock Units      
Restricted stock      
Beginning balance (in shares) 1,250    
Granted (in shares) 0    
Vested (in shares) (625)    
Forfeited (in shares) (625)    
Ending balance (in shares)   1,250  
Grant Date Fair Value      
Beginning balance (in dollars per share) $ 19.00    
Vested (in dollars per share) 20.00    
Forfeited (in dollars per share) $ 18.00    
Ending balance (in dollars per share)   $ 19.00