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EMPLOYEE STOCK COMPENSATION - Summary of SARs Activity (Details) - Stock appreciation rights - $ / shares
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Number of Shares          
Outstanding at beginning of year (in shares) 1,559,012 1,559,012 1,559,012    
Exercised (in shares) 0 0 (1,559,012)    
Outstanding at end of year (in shares)     0    
Exercisable at end of year (in shares)     0 1,559,012 1,559,012
Weighted-Average Exercise Price per Share          
Outstanding at beginning of year (in dollars per share) $ 11.60 $ 11.60 $ 11.60    
Exercised (in dollars per share) $ 0 $ 0 11.60    
Outstanding at end of year (in dollars per share)     0    
Exercisable at end of year (in dollars per share)     $ 0 $ 11.60 $ 11.60