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Stockholders' Equity and Stock Incentive Plans (Stock Options) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
May 17, 2012
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
May 16, 2012
Stock Options Activity [Roll Forward]          
Outstanding, beginning of period   3,107,916 4,605,055 7,169,668  
Granted   0 216,509 200,673  
Canceled   (1,323,500) (1,260,750) (1,463,497)  
Exercised   (241,964) (452,898) (1,301,789)  
Outstanding, end of period   1,542,452 3,107,916 4,605,055  
Exercisable   1,335,717 2,696,315    
Stock Options Activity, Weighted Average Option Price [Roll Forward]          
Outstanding, weighted average option price, beginning of period (in USD per share)   $ 23.36 $ 26.14 $ 25.73  
Granted, weighted average option price (in USD per share)   0.00 17.50 19.98  
Canceled, weighted average option price (in USD per share)   39.30 38.63 39.82  
Exercised, weighted average option price (in USD per share)   8.61 6.49 7.53  
Outstanding, weighted average option price, end of period (in USD per share)   11.99 23.36 $ 26.14  
Exercisable, weighted average option price (in USD per share)   $ 11.00 $ 24.27    
Additional Disclosures:          
Outstanding, weighted average remaining term   5 years 3 months 24 days      
Exercisable, weighted average remaining term   4 years 9 months 20 days 3 years 1 month 6 days    
Outstanding, aggregate intrinsic value   $ 35,565      
Exercisable, aggregate intrinsic value   32,128 $ 14,587    
Total intrinsic value of in-the-money options exercised during the period   3,900 5,900 $ 11,100  
Total fair value of options vested in period   1,600 $ 2,000 $ 1,900  
Stock Options          
Additional Disclosures:          
Total unrecognized share-based compensation costs related to unvested stock options   $ 200      
Total unrecognized share-based compensation costs related to unvested stock options, period for recognition   1 year 4 months 26 days      
Stock Incentive Plan 2012 [Member] | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Term of stock incentive plan 10 years        
Increase in number of common shares authorized under Stock Incentive Plan 4,000,000        
Number of common shares authorized for issuance under Stock Incentive Plan 21,000,000       17,000,000
Number of common shares available for grant under Stock Incentive Plan   4,400,000      
Number of authorized and unissued common shares under Stock Incentive Plan   9,700,000      
Award vesting period   3 years