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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, 2018
Dec. 31, 2017
Number of Shares    
Outstanding at beginning of period (in shares) 1,559,012  
Outstanding at end of period (in shares) 1,559,012 1,559,012
Exercisable at end of period (in shares) 1,559,012  
Weighted-Average Exercise Price Per Share    
Outstanding at beginning of period (in dollars per share) $ 11.60  
Outstanding at end of period (in dollars per share) 11.60 $ 11.60
Exercisable at end of period (in dollars per share) $ 11.60  
Weighted-Average Remaining Contract Term    
Outstanding 4 years 4 months 24 days 4 years 7 months 6 days
Exercisable at end of period 4 years 4 months 24 days  
Aggregated Intrinsic Value    
Outstanding $ 12,001 $ 14,105
Exercisable at end of period $ 12,001