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Equity Incentive Plans and Stock-Based Compensation (Details 3) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2012
Employee Stock Option
Dec. 31, 2011
Employee Stock Option
Dec. 31, 2010
Employee Stock Option
Jun. 22, 2012
Stock Option Exchange Program
Employee Stock Option
Dec. 31, 2012
Stock Option Exchange Program
Employee Stock Option
Dec. 31, 2012
Stock Options with Market Condition
Number of Shares            
Outstanding, at the beginning of the period (in shares) 14,587,596 13,969,383 14,456,110      
Options granted (in shares) 7,789,220 2,357,001 1,921,743   2,840,986 1,795,000
Options exercised (in shares) (221,934) (873,691) (996,946)      
Stock options forfeited (in shares) (2,610,812) (865,097) (1,411,524)      
Options surrendered in stock option exchange program (6,449,255)       (6,449,255)  
Outstanding, at the end of the period (in shares) 13,094,815 14,587,596 13,969,383     1,535,000
Vested or expected to vest at the end of the period (in shares) 12,185,462          
Options exercisable at the end of the period (in shares) 6,129,729          
Weighted Average Exercise Price            
Outstanding at the beginning of the year (in dollars per shares) $ 19.73 $ 18.85 $ 20.95      
Options granted (in dollars per share) $ 5.81 $ 18.83 $ 22.47 $ 5.63    
Options exercised (in dollars per share) $ 4.44 $ 8.46 $ 12.95      
Options forfeited (in dollars per share) $ 10.91 $ 14.53 $ 49.43      
Options surrendered in stock option exchange program ( in dollars per share) $ 21.11          
Outstanding at the end of the period (in dollars per shares) $ 12.79 $ 19.73 $ 18.85      
Vested or expected to vest at the end of the period (in dollars per share) $ 13.24          
Options exercisable at the end of the period (in dollars per share) $ 19.21          
Weighted Average Remaining Contractual Term (in years)            
Outstanding (in years) 6 years 0 months 15 days          
Vested or expected to vest (in years) 5 years 10 months 2 days          
Options exercisable (in years) 3 years 7 months 2 days          
Aggregate Intrinsic Value            
Outstanding $ 755          
Vested or expected to vest 611          
Options exercisable $ 0          
Closing stock price (in dollars per share) $ 4.87          
Total number of in-the-money outstanding (in shares) 1,106,084          
Total number of in-the-money exercisable (in shares) 6,152