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SHARE-BASED AWARDS AND OPTIONS - Share-Based Awards (Details) - Share-Based Awards
shares in Thousands
3 Months Ended
Mar. 31, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Beginning balance (shares) | shares 1,084
Granted (shares) | shares 458
Vested (shares) | shares (226)
Forfeited (shares) | shares (28)
Ending balance (shares) | shares 1,288
Weighted-Average Grant-Date Fair Value  
Beginning balance (USD per share) | $ / shares $ 108.51
Granted (USD per share) | $ / shares 133.13
Vested (USD per share) | $ / shares 92.19
Forfeited (USD per share) | $ / shares 99.65
Ending balance (USD per share) | $ / shares $ 120.33