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SHARE-BASED AWARDS AND OPTIONS - Share-Based Awards (Details) - Share-Based Awards
shares in Thousands
6 Months Ended
Jun. 30, 2019
$ / shares
shares
Shares  
Beginning balance (shares) | shares 1,084
Granted (shares) | shares 475
Vested (shares) | shares (260)
Forfeited (shares) | shares (62)
Ending balance (shares) | shares 1,237
Weighted-Average Grant-Date Fair Value  
Beginning balance (USD per share) | $ / shares $ 108.51
Granted (USD per share) | $ / shares 133.58
Vested (USD per share) | $ / shares 94.78
Forfeited (USD per share) | $ / shares 107.74
Ending balance (USD per share) | $ / shares $ 121.06