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STOCK-BASED COMPENSATION AND EMPLOYEE BENEFIT PLANS - Summary of Service-Based Restricted Activity (Details) - Service-based Restricted Shares - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Performance- based Restricted Shares      
Outstanding beginning of period (in shares) 717,079    
Granted (in shares) 362,459    
Vested (in shares) (329,343)    
Canceled (in shares) (38,033)    
Outstanding end of period (in shares) 712,162 717,079  
Expected to vest (in shares) 712,162    
Weighted Average Grant Date Fair Value      
Outstanding beginning of period (in usd per share) $ 16.58    
Granted (in usd per share) 16.96 $ 14.15 $ 21.46
Vested (in usd per share) 16.79    
Canceled (in usd per share) 17.30    
Outstanding end of period (in usd per share) 16.81 $ 16.58  
Expected to vest (in usd per share) $ 16.81