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EQUITY-BASED COMPENSATION - Restricted stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
EQUITY-BASED COMPENSATION        
offering period     3 years  
Payments for repurchase of common stock     $ 1,516 $ 657
Restricted Stock | Minimum        
EQUITY-BASED COMPENSATION        
offering period     1 year  
Restricted Stock Awards        
EQUITY-BASED COMPENSATION        
Compensation expense $ 2,200   $ 4,000 $ 2,100
Unrecognized compensation expense $ 13,600   $ 13,600  
Weighted-average remaining life     1 year 7 months 6 days  
Restricted stock        
Beginning balance (in shares)     496,945  
Granted (in shares)     1,373,930  
Vested (in shares)     (255,582)  
Forfeited (in shares)     (8,822)  
Ending balance (in shares) 1,606,471   1,606,471  
Grant Date Fair Value        
Beginning balance (in dollars per share)     $ 19.02  
Granted (in dollars per share)     8.77  
Vested (in dollars per share)     18.80  
Forfeited     19.79  
Ending balance (in dollars per share) $ 10.28   $ 10.28  
Restricted Stock Units        
EQUITY-BASED COMPENSATION        
Compensation expense   $ 1,200    
Weighted-average remaining life     1 year 7 months 6 days  
Restricted stock        
Beginning balance (in shares)     2,500  
Vested (in shares)     (1,250)  
Ending balance (in shares) 1,250   1,250  
Grant Date Fair Value        
Beginning balance (in dollars per share)     $ 19.00  
Vested (in dollars per share)     19.00  
Ending balance (in dollars per share) $ 19.00   $ 19.00  
Restricted Stock Units | Maximum        
EQUITY-BASED COMPENSATION        
offering period     3 years