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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Shares      
Nonvested, beginning of period (shares) 1,084 1,226 1,263
Replacement Awards (shares) 894    
Granted (shares) 784 650 899
Vested (shares) (781) (722) (858)
Forfeited (shares) (137) (70) (78)
Nonvested, end of period (shares) 1,844 1,084 1,226
Weighted-Average Grant-Date Fair Value      
Unvested, Weighted Average Grant-Date Fair Value, beginning of period (USD per share) $ 108.51 $ 78.29 $ 49.55
Replacement Awards Weighted Average Grant-Date Fair Value (USD per share) 163.74    
Granted, Weighted Average Grant-Date Fair Value (USD per share) 142.26 109.85 79.79
Vested, Weighted Average Grant-Date Fair Value (USD per share) 105.04 60.08 39.26
Forfeited, Weighted Average Grant-Date Fair Value (USD per share) 124.30 91.47 59.56
Unvested, Weighted Average Grant-Date Fair Value, end of period (USD per share) $ 149.96 $ 108.51 $ 78.29