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EQUITY-BASED COMPENSATION - Restricted stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
EQUITY-BASED COMPENSATION    
Payments for repurchase of common stock $ 6,636 $ 1,216
Restricted Stock    
EQUITY-BASED COMPENSATION    
Compensation expense $ 1,900 $ 1,800
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 $ 13,300  
Weighted-average remaining life 1 year 8 months 12 days  
Restricted stock    
Beginning balance (in shares) 1,518,193  
Granted (in shares) 1,271,706  
Vested (in shares) (406,289)  
Forfeited (in shares) (199,069)  
Ending balance (in shares) 2,184,541  
Grant Date Fair Value    
Beginning balance (in dollars per share) $ 10.08  
Granted (in dollars per share) 5.89  
Vested (in dollars per share) 12.54  
Forfeited 7.52  
Ending balance (in dollars per share) $ 7.42  
Restricted Stock Units    
Restricted stock    
Beginning balance (in shares) 1,250  
Vested (in shares) (625)  
Forfeited (in shares) (625)  
Grant Date Fair Value    
Beginning balance (in dollars per share) $ 19.00  
Vested (in dollars per share) 20.00  
Forfeited $ 18.00