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Equity Incentive Plans and Stock-Based Compensation (Details 2) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Apr. 30, 2009
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-Based Incentive Compensation Plans
Dec. 31, 2011
Stock-Based Incentive Compensation Plans
Dec. 31, 2010
Stock-Based Incentive Compensation Plans
Shares available for grant                  
Shares available, at the beginning of the year             2,812,876 5,348,162 7,462,394
Increase in shares approved for issuance 6,500,000           6,500,000    
Stock options granted (in shares)   (7,789,220) (2,357,001) (1,921,743)   (2,840,986) (7,789,220) [1] (2,357,001) (1,921,743)
Stock options forfeited (in shares)   2,610,812 865,097 1,411,524     2,610,812 [2] 865,097 1,411,524
Stock options expired under former plans (in shares)             (576,763) (503,526) (1,231,899)
Nonvested equity stock and stock units granted (in shares)             (1,113,014) [3] (562,257) [3] (453,468) [3]
Nonvested equity stock and stock units forfeited (in shares)             284,468 [3] 22,401 [3] 81,354 [3]
Shares available, at the end of the period             2,729,159 2,812,876 5,348,162
Conversion factor used to calculate the decrease in the number of shares available for grant resulting from the grant of restricted stock awards             1.5    
Conversion factor used to calculate the increase in the number of shares available for grant resulting from the forfeiture of restricted stock awards             1.5    
Minimum contractual term of options granted in stock option exchange program (in years)         5 years        
Vesting period           3 years      
Incremental compensation cost of new options granted           $ 1.0      
Unrecognized compensation cost of original options         $ 19.9        
Options granted (in dollars per share)   $ 5.81 $ 18.83 $ 22.47 $ 5.63        
Options surrendered in stock option exchange program   6,449,255       6,449,255      
Expected weighted-average period for recognition of compensation cost (in years)   2 years 9 months 19 days       3 years      
[1] Amount includes 2,840,986 shares that were granted from the stock option exchange program (discussed below).
[2] Amount excludes 6,449,255 shares that were surrendered from the stock option exchange program (discussed below) as the shares are no longer available for grant.
[3] For purposes of determining the number of shares available for grant under the 2006 Plan against the maximum number of shares authorized, each restricted stock granted reduces the number of shares available for grant by 1.5 shares and each restricted stock forfeited increases shares available for grant by 1.5 shares.