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Stockholders' Equity Stockholders' Equity (Outstanding stock options) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Range Of Exercise Prices, $4.60-4.60
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price range, lower range limit $ 4.60
Exercise price range, upper range limit $ 4.60
Number of outstanding options at end of year 1
Weighted-average remaining contractual life, options outstanding 29 days
Weighted average exercise price, options outstanding $ 4.66
Number of exercisable options at end of year 1
Weighted average exercise price, options exercisable $ 4.66
Range Of Exercise Prices, $4.78-4.78
  
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 $ 4.78
Number of outstanding options at end of year 79
Weighted-average remaining contractual life, options outstanding 6 years 4 months 17 days
Weighted average exercise price, options outstanding $ 4.78
Number of exercisable options at end of year 79
Weighted average exercise price, options exercisable $ 4.78
Range of Exercise Prices, $5.21-5.21
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price range, lower range limit $ 5.21
Exercise price range, upper range limit $ 5.21
Number of outstanding options at end of year 3
Weighted-average remaining contractual life, options outstanding 7 years 7 months 10 days
Weighted average exercise price, options outstanding $ 5.21
Number of exercisable options at end of year 3
Weighted average exercise price, options exercisable $ 5.21
Range Of Exercise Prices, $5.70-5.70
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price range, lower range limit $ 5.70
Exercise price range, upper range limit $ 5.70
Number of outstanding options at end of year 96
Weighted-average remaining contractual life, options outstanding 7 years 2 months 1 day
Weighted average exercise price, options outstanding $ 5.70
Number of exercisable options at end of year 69
Weighted average exercise price, options exercisable $ 5.70
Range Of Exercise Prices, $5.94-5.94
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price range, lower range limit $ 5.94
Exercise price range, upper range limit $ 5.94
Number of outstanding options at end of year 73
Weighted-average remaining contractual life, options outstanding 8 years 2 months 5 days
Weighted average exercise price, options outstanding $ 5.94
Number of exercisable options at end of year 40
Weighted average exercise price, options exercisable $ 5.94
Range Of Exercise Prices, $16.73-16.73
  
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 $ 16.73
Number of outstanding options at end of year 514
Weighted-average remaining contractual life, options outstanding 9 years 2 months 27 days
Weighted average exercise price, options outstanding $ 16.73
Number of exercisable options at end of year 0
Weighted average exercise price, options exercisable $ 0.00
Range of Exercise Prices, $4.60-16.73
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price range, lower range limit $ 4.60
Exercise price range, upper range limit $ 16.73
Number of outstanding options at end of year 766
Weighted-average remaining contractual life, options outstanding 8 years 6 months 26 days
Weighted average exercise price, options outstanding $ 13.03
Number of exercisable options at end of year 192
Weighted average exercise price, options exercisable $ 5.36