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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, 2021
$ / shares
shares
Shares  
Beginning balance (shares) | shares 1,546
Granted (shares) | shares 836
Vested (shares) | shares (578)
Forfeited (shares) | shares (14)
Ending balance (shares) | shares 1,790
Weighted-Average Grant-Date Fair Value  
Beginning balance (USD per share) | $ / shares $ 176.71
Granted (USD per share) | $ / shares 188.52
Vested (USD per share) | $ / shares 148.95
Forfeited (USD per share) | $ / shares 181.58
Ending balance (USD per share) | $ / shares $ 181.40