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Stock-Based Incentive Plan (Compensation Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 5,697 $ 4,768 $ 14,261 $ 15,575
Share-based compensation arrangement, compensation cost 2,000   3,200  
Service-based stock appreciation rights (SARs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 2,535 1,983 6,001 6,567
Service-based restricted stock units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 2,225 2,517 6,718 8,419
Market performance-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 301 14 482 17
Operating performance-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 636 $ 254 $ 1,060 $ 572