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Equity Incentive Plans and Stock-Based Compensation (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Stock Option Plans
        
Shares available for grant        
Stock options granted (in shares) (2,590,711) (487,550) (7,592,911) (2,199,761)
Stock options forfeited (in shares)     1,201,539  
Options surrendered in stock option exchange program     6,449,255  
Stock-Based Incentive Compensation Plans
        
Stock-Based Compensation        
Number of shares reserved under the 2006 Purchase Plan 21,400,000   21,400,000  
Shares available for grant        
Shares available, at the beginning of the year     2,812,876  
Increase in shares approved for issuance     6,500,000  
Stock options granted (in shares)     (7,592,911) [1]  
Stock options forfeited (in shares)     1,201,539 [2]  
Stock options expired under former plans (in shares)     (101,562)  
Nonvested equity stock and stock units granted (in shares)     (760,130) [3]  
Nonvested equity stock and stock units forfeited (in shares)     157,973 [3]  
Shares available, at the end of the period 2,217,785   2,217,785  
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   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   1.5  
Stock Option Exchange Program | Stock Option Plans
        
Shares available for grant        
Stock options granted (in shares)     (2,840,986)  
Options surrendered in stock option exchange program     6,449,255  
[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.