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SHARE-BASED AWARDS AND OPTIONS - Restricted Stock Awards and Performance Units Activity (Details) - Restricted Stock Awards and Performance Units - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Shares      
Unvested at beginning of period (shares) 1,844 1,084 1,226
Replacement Awards (shares)   894  
Granted (shares) 607 784 650
Vested (shares) (835) (781) (722)
Forfeited (shares) (70) (137) (70)
Unvested at end of period (shares) 1,546 1,844 1,084
Weighted-Average Grant-Date Fair Value      
Unvested at beginning of period (USD per share) $ 149.96 $ 108.51 $ 78.29
Replacement Awards (USD per share)   163.74  
Granted (USD per share) 191.20 142.26 109.85
Vested (USD per share) 128.91 105.04 60.08
Forfeited (USD per share) 168.40 124.30 91.47
Unvested at end of period (USD per share) $ 176.71 $ 149.96 $ 108.51