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STOCK-BASED COMPENSATION AND EMPLOYEE BENEFIT PLANS - Summary of Performance-Based Restricted Stock Activity (Details) - Performance- based Restricted Shares - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Performance- based Restricted Shares      
Outstanding beginning of period (in shares) 310,951    
Granted (in shares) 110,678    
Vested (in shares) (59,437)    
Canceled (in shares) (21,503)    
Outstanding end of period (in shares) 340,689 310,951  
Expected to vest (in shares) 53,841    
Weighted Average Grant Date Fair Value      
Outstanding beginning of period (in usd per share) $ 17.94    
Granted (in usd per share) 22.00 $ 17.62 $ 17.11
Vested (in usd per share) 19.41    
Canceled (in usd per share) 19.41    
Outstanding end of period (in usd per share) 18.91 $ 17.94  
Expected to vest (in usd per share) $ 22.15