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EMPLOYEE STOCK COMPENSATION - Summary of SARs Activity (Details) - Stock appreciation rights - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Number of Shares        
Outstanding at beginning of period (in shares) 1,559,012 1,559,012 1,559,012  
Outstanding at end of period (in shares) 1,559,012 1,559,012 1,559,012 1,559,012
Exercisable at end of period (in shares) 1,559,012   1,559,012  
Weighted-Average Exercise Price Per Share        
Outstanding at beginning of period (in dollars per share) $ 11.60 $ 11.60 $ 11.60  
Outstanding at end of period (in dollars per share) 11.60 $ 11.60 11.60 $ 11.60
Exercisable at end of period (in dollars per share) $ 11.60   $ 11.60  
Weighted-Average Remaining Contract Term        
Outstanding 3 years 10 months 24 days 4 years 1 month 24 days 3 years 10 months 24 days 4 years 7 months 6 days
Exercisable at end of period 3 years 10 months 24 days   3 years 10 months 24 days  
Aggregated Intrinsic Value        
Outstanding $ 11,377 $ 12,390 $ 11,377 $ 14,105
Exercisable at end of period $ 11,377   $ 11,377