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SHARE-BASED AWARDS AND STOCK OPTIONS - Share-Based Awards (Details) - Share-Based Awards
shares in Thousands
3 Months Ended
Mar. 31, 2020
$ / shares
shares
Shares  
Beginning balance (shares) | shares 1,844
Granted (shares) | shares 546
Vested (shares) | shares (553)
Forfeited (shares) | shares (18)
Ending balance (shares) | shares 1,819
Weighted-Average Grant-Date Fair Value  
Beginning balance (USD per share) | $ / shares $ 149.96
Granted (USD per share) | $ / shares 193.36
Vested (USD per share) | $ / shares 116.66
Forfeited (USD per share) | $ / shares 152.88
Ending balance (USD per share) | $ / shares $ 173.12