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EMPLOYEE STOCK COMPENSATION - Summary of SARs Activity (Details) - Stock appreciation rights
 3 Months Ended
Mar. 31, 2021
$ / shares
shares
Number of Shares  
Outstanding at beginning of period (in shares) | shares 1,559,012
Exercised (in shares) | shares (1,559,012)
Outstanding at end of period (in shares) | shares 0
Exercisable at end of period (in shares) | shares 0
Weighted-Average Exercise Price Per Share  
Outstanding at beginning of period (in dollars per share) | $ / shares $ 11.60
Exercised (in dollars per share) | $ / shares 11.60
Outstanding at end of period (in dollars per share) | $ / shares 0
Exercisable at end of period (in dollars per share) | $ / shares $ 0