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Equity Incentive Plans and Stock-Based Compensation (Details 3) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2012
Employee Stock Option
Dec. 31, 2013
Employee Stock Option
Dec. 31, 2012
Employee Stock Option
Dec. 31, 2011
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
Dec. 31, 2013
Stock Options with Market Condition
Number of Shares                
Outstanding, at the beginning of the period (in shares)   13,094,815 14,587,596 13,969,383       1,315,000
Options granted (in shares)   2,084,276 7,789,220 2,357,001   2,840,986 1,795,000  
Options exercised (in shares)   (483,923) (221,934) (873,691)        
Stock options forfeited (in shares)   (3,318,022) (2,610,812) (865,097)        
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 11,377,146 13,094,815 14,587,596     1,535,000 1,315,000
Vested or expected to vest at the end of the period (in shares)   10,685,898            
Options exercisable at the end of the period (in shares)   6,242,733            
Weighted Average Exercise Price                
Outstanding at the beginning of the year (in dollars per shares)   $ 12.79 $ 19.73 $ 18.85        
Options granted (in dollars per share)   $ 6.09 $ 5.81 $ 18.83 $ 5.63      
Options exercised (in dollars per share)   $ 6.72 $ 4.44 $ 8.46        
Options forfeited (in dollars per share)   $ 14.51 $ 10.91 $ 14.53        
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 $ 11.32 $ 12.79 $ 19.73        
Vested or expected to vest at the end of the period (in dollars per share)   $ 11.64            
Options exercisable at the end of the period (in dollars per share)   $ 15.35            
Weighted Average Remaining Contractual Term (in years)                
Outstanding (in years)   5 years 8 months 5 days            
Vested or expected to vest (in years)   5 years 6 months 4 days            
Options exercisable (in years)   3 years 8 months 5 days            
Aggregate Intrinsic Value                
Outstanding   $ 24,540            
Vested or expected to vest   22,113            
Options exercisable   $ 6,779            
Closing stock price (in dollars per share)   $ 9.47            
Total number of in-the-money outstanding (in shares)   7,167,696            
Total number of in-the-money exercisable (in shares)   2,453,877