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EMPLOYEE STOCK COMPENSATION - Summary of SARs Activity (Details) - Stock appreciation rights - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2018
Sep. 30, 2019
Dec. 31, 2018
Jun. 30, 2019
Number of Shares          
Outstanding at beginning of period (in shares) 1,559,012   1,559,012    
Outstanding at end of period (in shares) 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    
Outstanding at end of period (in dollars per share) 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 2 years 10 months 24 days 3 years 2 months 12 days 2 years 10 months 24 days 3 years 7 months 6 days  
Exercisable at end of period 2 years 10 months 24 days   2 years 10 months 24 days    
Aggregated Intrinsic Value          
Outstanding $ 3,956   $ 3,956 $ 2,662 $ 3,691
Exercisable at end of period $ 3,956   $ 3,956