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Equity Incentive Plans and Stock-Based Compensation (Details 3) (Stock Option Plans, USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Y
Dec. 31, 2010
Dec. 31, 2009
Stock Option Plans
      
Number of Shares      
Outstanding, at the beginning of the period (in shares) 13,969,383 14,456,110 16,573,739
Options granted (in shares) 2,357,001 1,921,743 1,487,905
Options exercised (in shares) (873,691) (996,946) (1,482,489)
Stock options forfeited (in shares) (865,097) (1,411,524) (2,123,045)
Outstanding, at the end of the period (in shares) 14,587,596 13,969,383 14,456,110
Vested or expected to vest at the end of the period (in shares) 14,103,419    
Options exercisable at the end of the period (in shares) 10,428,578    
Weighted Average Exercise Price      
Outstanding at the beginning of the year (in dollars per shares) $ 18.85 $ 20.95 $ 21.19
Options granted (in dollars per share) $ 18.83 $ 22.47 $ 9.21
Options exercised (in dollars per share) $ 8.46 $ 12.95 $ 11.29
Options forfeited (in dollars per share) $ 14.53 $ 49.43 $ 21.34
Outstanding at the end of the period (in dollars per shares) $ 19.73 $ 18.85 $ 20.95
Vested or expected to vest at the end of the period (in dollars per share) $ 19.76    
Options exercisable at the end of the period (in dollars per share) $ 20.26    
Weighted Average Remaining Contractual Term (in years)      
Outstanding (in years) 5.49    
Vested or expected to vest (in years) 5.38    
Options exercisable (in years) 4.36    
Aggregate Intrinsic Value      
Outstanding $ 806    
Vested or expected to vest 806    
Options exercisable $ 806    
Closing stock price (in dollars per share) $ 7.55    
Total number of in-the-money outstanding (in shares) 262,467    
Total number of in-the-money exercisable (in shares) 262,467