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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average remaining contractual term of outstanding stock options 3 years 1 month 6 days    
Number of vested and exercisable stock options (in shares) 1,402,500    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 11,300    
Vested and exercisable stock options, weighted average exercise price (in dollars per share) $ 19.95    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 3 years 1 month 6 days    
Share-based compensation expense $ 13,423 $ 9,477 $ 18,615
Share based compensation, tax benefits $ 6,100 $ 4,600 $ 8,100
Total stock options granted 274,000 259,000 714,000
Employee [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 13,400 $ 9,500 $ 18,600
Non-employee Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 1,400 1,500 1,400
Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares of common stock exchanged for each award 1    
Number of shares available for future grant (in shares) 448,000    
Fair value of restricted stock units that vested during period $ 1,000 $ 8,000 8,000
Aggregate intrinsic value 1,100   $ 300
Restricted stock expense $ 6,500    
Weighted average period over which unrecognized compensation cost is expected to be recognized 1 year 3 months 18 days    
Granted, Weighted Average Grant Date Fair Value (in dollars per share) $ 19.14 $ 23.07 $ 27.10
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares of common stock exchanged for each award 1    
Term of Stock Options 10 years    
Number of shares authorized for grant 327,584    
Number of shares available for future grant (in shares) 448,000    
Stock option expense $ 700    
Weighted average period over which unrecognized compensation cost is expected to be recognized 6 months    
Total granted and outstanding (in shares) 2,174,500    
Intrinsic value of outstanding stock options $ 18,500    
Weighted average remaining contractual term of outstanding stock options 4 years 3 months 18 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 4 years 3 months 18 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 772,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Granted In Period, Expected To Vest 756,876    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Total Intrinsic Value $ 7,200    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 18.49    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Granted In Period, Weighted Average Remaining Contractual Term 6 years 6 months    
Granted, Grant Date Fair Value (in dollars per share) $ 16.20 $ 16.07 $ 18.40
Unrestricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of unrestricted stock units issued $ 1,400 $ 1,500 $ 1,500
Granted, Weighted Average Grant Date Fair Value (in dollars per share) $ 21.67 $ 21.93 $ 30.81