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Equity Incentive Plans and Stock-Based Compensation (Details 2) (Stock Option Plans, USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Stock Option Plans
        
Number of Shares        
Outstanding, at the beginning of the period (in shares)     13,969,383  
Stock option granted (in shares) 78,510 138,350 1,712,211 1,725,323
Options exercised (in shares)     (478,974)  
Stock options forfeited (in shares)     (447,417)  
Outstanding, at the end of the period (in shares) 14,755,203   14,755,203  
Vested or expected to vest at the end of the period (in shares) 14,209,999   14,209,999  
Options exercisable at the end of the period (in shares) 10,199,075   10,199,075  
Weighted Average Exercise Price        
Outstanding at the beginning of the year (in dollars per share)     $ 18.85  
Options granted (in dollars per share) $ 20.71   $ 20.71  
Options exercised (in dollars per share) $ 10.29   $ 10.29  
Options forfeited (in dollars per share)     $ 11.48  
Outstanding at the end of the period (in dollars per share) $ 19.57   $ 19.57  
Vested or expected to vest at the end of the period (in shares) $ 19.56   $ 19.56  
Options exercisable at the end of the period (in shares) $ 19.76   $ 19.76  
Weighted Average Remaining Contractual Term (in years)        
Outstanding (in years) 5.61   5.61  
Vested or expected to vest (in years)     5.49  
Options exercisable (in years)     4.36  
Aggregate Intrinsic Value        
Outstanding $ 14,793   $ 14,793  
Vested or expected to vest 14,406   14,406  
Options exercisable $ 10,787   $ 10,787  
Closing stock price (in dollars per share) $ 14.68   $ 14.68  
Total number of in-the-money outstanding (in shares) 2,529,882   2,529,882  
Total number of in-the-money exercisable (in shares) 1,819,311   1,819,311