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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of restricted stock units that vested during period $ 8,000 $ 8,000 $ 17,500
Aggregate intrinsic value   300 600
Restricted stock expense 7,500    
Stock option expense $ 1,900    
Weighted average remaining contractual term of outstanding stock options 4 years    
Number of vested and exercisable stock options (in shares) 1,485,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 1,600    
Vested and exercisable stock options, weighted average exercise price (in dollars per share) $ 19.57    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 4 years    
Share-based compensation expense $ 9,477 18,615 6,623
Share based compensation, tax benefits $ 4,000 $ 7,500 $ 2,600
Total stock options granted 259,000 714,000 200,000
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) 754,500    
Weighted average period over which unrecognized compensation cost is expected to be recognized 1 year 7 months 6 days    
Granted, Weighted Average Grant Date Fair Value (in dollars per share) $ 23.07 $ 27.10 $ 19.87
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 489,022    
Number of shares available for future grant (in shares) 722,000    
Weighted average period over which unrecognized compensation cost is expected to be recognized 1 year 4 months 24 days    
Total granted and outstanding (in shares) 1,998,000    
Intrinsic value of outstanding stock options $ 3,000    
Weighted average remaining contractual term of outstanding stock options 4 years 10 months 24 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 4 years 10 months 24 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 513,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Granted In Period, Expected To Vest 483,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Total Intrinsic Value $ 1,300    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 19.27    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Granted In Period, Weighted Average Remaining Contractual Term 7 years 3 months 18 days    
Granted, Grant Date Fair Value (in dollars per share) $ 16.07 $ 18.40 $ 20.80