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EMPLOYEE STOCK COMPENSATION - Summary of SARs Activity (Details) - Stock appreciation rights - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Number of Shares    
Outstanding at beginning of period (in shares) 1,561,681  
Granted (in shares) 0  
Exercised (in shares) 0  
Forfeited (in shares) (2,222)  
Outstanding at end of period (in shares) 1,559,459 1,561,681
Exercisable at end of period (in shares) 1,548,620  
Weighted- Average Exercise Price per Share    
Outstanding at beginning of period (in usd per share) $ 11.60  
Granted (in usd per share) 0.00  
Exercised (in usd per share) 0.00  
Forfeited (in usd per share) 10.09  
Outstanding at end of period (in usd per share) 11.60 $ 11.60
Exercisable at end of period (in usd per share) $ 11.61  
Weighted- Average Remaining Contract Term    
Outstanding 6 years 4 months 22 days 6 years 7 months 21 days
Forfeited 6 years 4 months 22 days  
Exercisable at end of period 6 years 4 months 22 days  
Aggregated Intrinsic Value    
Outstanding $ 4,716  
Granted 0  
Exercised 0  
Forfeited 0  
Outstanding 9,198 $ 4,716
Exercisable at end of period $ 9,117  
Number of Shares    
Outstanding at beginning of period (in shares) 25,963  
Granted (in shares) 0  
Vested (in shares) (12,902)  
Forfeited (in shares) (2,222)  
Outstanding at end of period (in shares) 10,839 25,963
Weighted- Average Price per Share    
Outstanding at beginning of period (in usd per share) $ 10.09  
Granted (in usd per share) 0.00  
Vested (in usd per share) 10.09  
Forfeited (in usd per share) 10.09  
Outstanding at end of period (in usd per share) $ 10.09 $ 10.09