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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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Stock Options with Market Condition
Dec. 31, 2012
Stock Options with Market Condition
Number of Shares            
Outstanding, at the beginning of the period (in shares)     13,094,815   1,445,000 1,535,000
Options granted (in shares) 141,575 2,590,711 1,897,887 7,592,911    
Options exercised (in shares)     (268,493)      
Options forfeited (in shares)     (2,330,448)      
Outstanding, at the end of the period (in shares) 12,393,761   12,393,761   1,445,000 1,535,000
Vested or expected to vest at the end of the period (in shares) 11,652,306   11,652,306      
Options exercisable at the end of the period (in shares) 6,562,258   6,562,258      
Weighted Average Exercise Price            
Outstanding at the beginning of the year (in dollars per shares)     $ 12.79      
Options granted (in dollars per share)     $ 5.80      
Options exercised (in dollars per share)     $ 6.84      
Options forfeited (in dollars per share)     $ 12.10      
Outstanding at the end of the period (in dollars per shares) $ 11.98   $ 11.98      
Vested or expected to vest at the end of the period (in dollars per share) $ 12.34   $ 12.34      
Options exercisable at the end of the period (in dollars per share) $ 16.87   $ 16.87      
Weighted Average Remaining Contractual Term            
Outstanding     5 years 7 months 10 days      
Vested or expected to vest     5 years 5 months 12 days      
Options exercisable     3 years 5 months 27 days      
Aggregate Intrinsic Value            
Outstanding $ 26,070   $ 26,070      
Vested or expected to vest 23,406   23,406      
Options exercisable $ 5,877   $ 5,877      
Closing stock price (in dollars per share) $ 9.40   $ 9.40      
Total number of in-the-money outstanding (in shares) 7,645,637   7,645,637      
Total number of in-the-money exercisable (in shares) 2,268,480   2,268,480