v2.4.0.6
Stockholders' Equity and Stock Incentive Plans (Stock Options) (Details) (USD $)
 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Stock Options
May 17, 2012
Stock Incentive Plan 2012 [Member]
Stock Options
Dec. 31, 2012
Stock Incentive Plan 2012 [Member]
Stock Options
May 16, 2012
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           2,200,000  
Number of authorized and unissued common shares under Stock Incentive Plan           17,800,000  
Award vesting period           3 years  
Stock Options Activity [Roll Forward]              
Outstanding, beginning of period 10,671,343 10,519,503 9,569,657        
Granted 537,840 541,340 1,190,867        
Canceled (366,344) (316,743) (126,496)        
Exercised (16,835) (72,757) (114,525)        
Outstanding, end of period 10,826,004 10,671,343 10,519,503        
Exercisable 9,545,547 8,911,028          
Stock Options Activity, Weighted Average Option Price [Roll Forward]              
Outstanding, weighted average option price, beginning of period (in USD per share) $ 24.81 $ 25.76 $ 27.68        
Granted, weighted average option price (in USD per share) $ 5.22 $ 6.74 $ 8.34        
Canceled, weighted average option price (in USD per share) $ 21.40 $ 29.91 $ 24.64        
Exercised, weighted average option price (in USD per share) $ 6.95 $ 5.46 $ 6.31        
Outstanding, weighted average option price, end of period (in USD per share) $ 23.98 $ 24.81 $ 25.76        
Exercisable, weighted average option price (in USD per share) $ 26.31 $ 28.20          
Additional Disclosures:              
Outstanding, weighted average remaining term 5 years 0 months 15 days            
Exercisable, weighted average remaining term 4 years 6 months 4 years 11 months 12 days          
Outstanding, aggregate intrinsic value $ 810,000            
Exercisable, aggregate intrinsic value 47,000 1,011,000          
Total intrinsic value of in-the-money options exercised during the period 19,000 300,000 700,000        
Total fair value of options vested in period 4,800,000 5,100,000 9,700,000        
Total unrecognized share-based compensation costs related to unvested stock options       $ 3,800,000      
Total unrecognized share-based compensation costs related to unvested stock options, period for recognition       1 year 4 months 24 days