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Stockholders' Equity Stockholders' Equity (Outstanding stock options) (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Range Of Exercise Prices, $4.78-5.94  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price range, lower range limit $ 4.78
Exercise price range, upper range limit $ 5.94
Number of outstanding options at end of year | shares 149,021
Weighted-average remaining contractual life, options outstanding 5 years 3 months 22 days
Weighted average exercise price, options outstanding $ 5.55
Number of exercisable options at end of year | shares 149,021
Weighted average exercise price, options exercisable $ 5.55
Range Of Exercise Prices, $16.73-17.21  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price range, lower range limit 16.73
Exercise price range, upper range limit $ 17.21
Number of outstanding options at end of year | shares 396,500
Weighted-average remaining contractual life, options outstanding 7 years 1 month 28 days
Weighted average exercise price, options outstanding $ 16.73
Number of exercisable options at end of year | shares 254,498
Weighted average exercise price, options exercisable $ 16.73
Range of Exercise Prices, $18.86-20.49  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price range, lower range limit 18.86
Exercise price range, upper range limit $ 20.49
Number of outstanding options at end of year | shares 1,149,868
Weighted-average remaining contractual life, options outstanding 4 years 7 months 13 days
Weighted average exercise price, options outstanding $ 21.45
Number of exercisable options at end of year | shares 179,400
Weighted average exercise price, options exercisable $ 20.39
Range of Exercise Prices, $4.78-20.49  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price range, lower range limit 4.78
Exercise price range, upper range limit $ 20.49
Number of outstanding options at end of year | shares 1,695,389
Weighted-average remaining contractual life, options outstanding 5 years 3 months 7 days
Weighted average exercise price, options outstanding $ 18.95
Number of exercisable options at end of year | shares 582,919
Weighted average exercise price, options exercisable $ 15.00