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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
Mar. 31, 2019
Jun. 30, 2018
Dec. 31, 2018
Number of Shares      
Outstanding at beginning of period (in shares) 1,559,012    
Outstanding at end of period (in shares) 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    
Exercisable at end of period (in dollars per share) $ 11.60    
Weighted-Average Remaining Contract Term      
Outstanding 3 years 4 months 24 days 3 years 7 months  
Exercisable at end of period 3 years 4 months 24 days    
Aggregated Intrinsic Value      
Outstanding $ 3,488   $ 2,662
Exercisable at end of period $ 3,488