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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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 28, 2013
Jun. 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     1,535,000 1,535,000
Options granted (in shares) 136,875 3,065,198 1,756,312 5,002,200      
Options exercised (in shares)     (44,850)        
Options forfeited (in shares)     (1,637,125)        
Outstanding, at the end of the period (in shares) 13,169,152   13,169,152     1,535,000 1,535,000
Vested or expected to vest at the end of the period (in shares) 12,273,266   12,273,266        
Options exercisable at the end of the period (in shares) 6,615,397   6,615,397        
Weighted Average Exercise Price              
Outstanding at the beginning of the year (in dollars per shares)     $ 12.79        
Options granted (in dollars per share)     $ 5.51        
Options exercised (in dollars per share)     $ 6.23        
Options forfeited (in dollars per share)     $ 11.17        
Outstanding at the end of the period (in dollars per shares) $ 12.04   $ 12.04        
Vested or expected to vest at the end of the period (in dollars per share) $ 12.47   $ 12.47        
Options exercisable at the end of the period (in dollars per share) $ 17.59   $ 17.59        
Weighted Average Remaining Contractual Term              
Outstanding     5 years 11 months 5 days        
Vested or expected to vest     5 years 8 months 5 days        
Options exercisable     3 years 5 months 12 days        
Aggregate Intrinsic Value              
Outstanding $ 21,033   $ 21,033        
Vested or expected to vest 18,444   18,444        
Options exercisable $ 3,088   $ 3,088        
Closing stock price (in dollars per share)         $ 8.59    
Total number of in-the-money outstanding (in shares) 8,126,102   8,126,102        
Total number of in-the-money exercisable (in shares) 1,991,014   1,991,014