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SHARE-BASED COMPENSATION - RSU and PSU Activity (Details) - Restricted stock unit and performance stock unit - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Number of Shares    
Beginning balance (in shares) 500 334
Granted (in shares) 204 256
Vested (in shares) (110) (76)
Forfeited (in shares) (7) (14)
Ending balance (in shares) 587 500
Weighted Average Grant Date Fair Value per Share    
Beginning balance (dollar per share) $ 231.57 $ 221.25
Granted (dollar per share) 379.94 241.19
Vested (dollar per share) 232.59 221.15
Forfeited (dollar per share) 266.94 229.75
Ending balance (dollar per share) $ 282.45 $ 231.57