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EMPLOYEE STOCK COMPENSATION - Summary of SARs Activity (Details) - Stock appreciation rights
 3 Months Ended 6 Months Ended
Jun. 30, 2021
$ / shares
shares
Jun. 30, 2021
$ / shares
shares
Number of Shares    
Outstanding at beginning of period (in shares) | shares 0 1,559,012
Exercised (in shares) | shares 0 (1,559,012)
Outstanding at end of period (in shares) | shares 0 0
Exercisable at end of period (in shares) | shares 0 0
Weighted-Average Exercise Price Per Share    
Outstanding at beginning of period (in dollars per share) | $ / shares $ 0 $ 11.60
Exercised (in dollars per share) | $ / shares 0 11.60
Outstanding at end of period (in dollars per share) | $ / shares 0 0
Exercisable at end of period (in dollars per share) | $ / shares $ 0 $ 0