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EQUITY-BASED COMPENSATION - Time-Based Restricted Stock Awards (Details) - Restricted Stock Awards - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Apr. 24, 2016
Mar. 08, 2016
Mar. 03, 2016
Feb. 24, 2016
Mar. 03, 2015
Jun. 30, 2016
Dec. 31, 2015
Time-Based              
Number of Shares              
Non-vested at the beginning of period (in shares)           250,011  
Granted (in shares)           191,717  
Vested (in shares)           (82,869)  
Forfeited (in shares)           (406)  
Non-vested at the end of period (in shares)           358,453  
Weighted Average Grant Date Fair Value              
Non-vested at the beginning of period (in dollars per share)           $ 12.03  
Granted (in dollars per share)           11.35  
Vested (in dollars per share)           11.06  
Forfeited, (in dollars per share)           10.27  
Non-vested at the end of period (in dollars per share)           $ 11.89  
Aggregate Current Value              
Non-vested outstanding           $ 4,746 $ 2,988
Performance-Based              
Number of Shares              
Non-vested at the beginning of period (in shares)           308,367  
Granted (in shares)           254,563  
Vested (in shares)           (113,903)  
Non-vested at the end of period (in shares)           449,027  
Weighted Average Grant Date Fair Value              
Non-vested at the beginning of period (in dollars per share)           $ 12.95  
Granted (in dollars per share)           13.77  
Vested (in dollars per share)           7.10  
Non-vested at the end of period (in dollars per share)           $ 14.90  
Aggregate Current Value              
Non-vested outstanding           $ 5,945 $ 3,685
Employees | Time-Based              
Equity-based compensation              
Vesting period       4 years      
Number of Shares              
Granted (in shares)       22,010      
Employees | Period one | Time-Based              
Equity-based compensation              
Vesting percentage       20.00%      
Employees | Period two | Time-Based              
Equity-based compensation              
Vesting percentage       20.00%      
Employees | Period three | Time-Based              
Equity-based compensation              
Vesting percentage       20.00%      
Employees | Period four | Time-Based              
Equity-based compensation              
Vesting percentage       40.00%      
Executive officers and management | Time-Based              
Number of Shares              
Granted (in shares)         149,410    
Executive officers and management | Cliff vest | Time-Based              
Number of Shares              
Granted (in shares)         37,230    
Executive officers and management | Period one | Time-Based              
Equity-based compensation              
Vesting percentage         25.00%    
Executive officers and management | Period two | Time-Based              
Equity-based compensation              
Vesting percentage         25.00%    
Executive officers and management | Period three | Time-Based              
Equity-based compensation              
Vesting percentage         50.00%    
Executive officers | Time-Based              
Number of Shares              
Granted (in shares) 16,930 169,707          
Executive officers | Performance-Based              
Number of Shares              
Granted (in shares)   254,563 154,505        
Executive officers | Period one | Time-Based              
Equity-based compensation              
Vesting percentage   25.00%          
Executive officers | Period two | Time-Based              
Equity-based compensation              
Vesting percentage   25.00%          
Executive officers | Period three | Time-Based              
Equity-based compensation              
Vesting percentage   50.00%