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Stock-Based Incentive Plan (Executed Agreements) (Details)
shares in Thousands
6 Months Ended
Jun. 30, 2018
$ / shares
shares
Service-based stock appreciation rights (SARs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares (in shares) | shares 634
Weighted average grant date fair value (in dollars per share) | $ / shares $ 27.87
Service-based restricted stock units (RSUs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares (in shares) | shares 227
Weighted average grant date fair value (in dollars per share) | $ / shares $ 91.91
Market performance-based restricted stock units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares (in shares) | shares 41
Weighted average grant date fair value (in dollars per share) | $ / shares $ 99.97
Operating performance-based restricted stock units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares (in shares) | shares 41
Weighted average grant date fair value (in dollars per share) | $ / shares $ 88.38