Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Details 3)

v2.4.0.8
Stock-Based Compensation (Details 3) (Stock options for employees, consultants, and non-employee directors, USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Options      
Outstanding at the beginning of the period (in shares) 5,277,412 4,863,718 4,998,337
Granted (in shares) 190,413 738,915 486,833
Exercised (in shares) (721,050) (298,947) (447,528)
Forfeited (in shares) (109,304) (26,274) (173,924)
Outstanding at the end of the period (in shares) 4,637,471 5,277,412 4,863,718
Options exercisable (in shares) 3,417,153    
Weighted-Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share) $ 8.86 $ 8.19 $ 7.64
Granted (in dollars per share) $ 15.34 $ 12.53 $ 12.37
Exercised (in dollars per share) $ 8.86 $ 6.92 $ 6.14
Forfeited (in dollars per share) $ 12.33 $ 11.03 $ 9.36
Outstanding at the end of the period (in dollars per share) $ 9.04 $ 8.86 $ 8.19
Options exercisable (in dollars per share) $ 8.08    
Weighted-Average Remaining Contractual Life      
Outstanding 5 years 4 months 24 days 6 years 3 months 18 days 6 years 9 months 18 days
Options exercisable 4 years 7 months 6 days    
Aggregate Intrinsic Value      
Outstanding (in dollars) $ 31,877 $ 26,885 $ 18,704
Options exercisable (in dollars) $ 110,111    
Additional disclosures      
Aggregate difference between fair value of the Company's common stock (in dollars per share) $ 40.30 $ 13.95 $ 11.96
Minimum
      
Additional disclosures      
Exercise prices of stock options outstanding (in dollars per share) $ 0.11    
Maximum
      
Additional disclosures      
Exercise prices of stock options outstanding (in dollars per share) $ 15.34