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Stock-Based Incentive Plan (Executed Agreements) (Details)
shares in Thousands
9 Months Ended
Sep. 30, 2017
$ / shares
shares
Service-based stock appreciation rights (SARs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares (in shares) | shares 639
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 17.03
Service-based restricted stock units (RSUs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares (in shares) | shares 108
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 57.37
Market performance-based restricted stock units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares (in shares) | shares 158
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 25.29
Operating performance-based restricted stock units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares (in shares) | shares 189
Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 56.18