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SHARE-BASED AWARDS AND OPTIONS - Share-Based Awards (Details) - Share-Based Awards
shares in Thousands
9 Months Ended
Sep. 30, 2018
$ / 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 1,226
Granted (shares) | shares 600
Vested (shares) | shares (715)
Forfeited (shares) | shares (55)
Ending balance (shares) | shares 1,056
Weighted-Average Grant-Date Fair Value  
Beginning balance (USD per share) | $ / shares $ 78.29
Granted (USD per share) | $ / shares 107.16
Vested (USD per share) | $ / shares 62.89
Forfeited (USD per share) | $ / shares 90.40
Ending balance (USD per share) | $ / shares $ 104.52