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SHARE-BASED AWARDS AND OPTIONS - Share-Based Awards (Details) - Share-Based Awards
shares in Thousands
9 Months Ended
Sep. 30, 2017
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Beginning balance (in shares) | shares 1,263
Granted (in shares) | shares 611
Vested (in shares) | shares (685)
Forfeited (in shares) | shares (71)
Ending balance (in shares) | shares 1,118
Weighted-Average Grant-Date Fair Value  
Beginning balance (in USD per share) | $ / shares $ 49.55
Granted (in USD per share) | $ / shares 71.77
Vested (in USD per share) | $ / shares 40.35
Forfeited (in USD per share) | $ / shares 60.36
Ending balance (in USD per share) | $ / shares $ 66.74