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Stockholders' Equity and Contingently Redeemable Common Stock (Details 2) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2010
Aug. 31, 2010
Dec. 31, 2010
Dec. 31, 2010
Dec. 31, 2012
Feb. 25, 2010
Share repurchase program            
Number of shares authorized to be repurchased under 2001 plan         19,000,000  
Additional number of shares authorized to be repurchased           12,500,000
Value of common stock to be repurchased from JP Morgan   $ 90,000,000        
Prepayment to JP Morgan under Share repurchase agreement       90,000,000    
Number of shares delivered by JP Morgan 4,800,000          
Average price of shares delivered by JP Morgan (in dollars per share) $ 18.88   $ 18.88 $ 18.88    
Number of shares repurchased during the period     9,500,000      
Value of shares repurchased during the period     195,100,000      
Cumulative shares that have been repurchased in stock repurchase program         26,300,000  
Cumulative value of shares that have been repurchased in stock repurchase program         428,900,000  
Remaining shares authorized to be repurchased         5,200,000  
Increase in accumulated deficit due to stock repurchase       $ 163,600,000