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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Restricted Shares      
Outstanding beginning of period (in shares) 712,162    
Granted (in shares) 341,273    
Vested (in shares) (298,479)    
Canceled (in shares) (23,830)    
Outstanding end of period (in shares) 731,126 712,162  
Expected to vest (in shares) 731,126    
Weighted Average Grant Date Fair Value      
Outstanding beginning of period (in usd per share) $ 16.81    
Granted (in usd per share) 21.12 $ 16.96 $ 14.15
Vested (in usd per share) 17.20    
Canceled (in usd per share) 17.53    
Outstanding end of period (in usd per share) 18.64 $ 16.81  
Expected to vest (in usd per share) $ 18.64