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Common And Preferred Stock (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 12 Months Ended
Dec. 06, 2011
Apr. 21, 2008
Dec. 31, 2011
Dec. 31, 2010
Common And Preferred Stock [Abstract]        
Share repurchase authorized amount $ 50 $ 75 $ 125  
Share repurchased     0 0
Common stock, shares authorized     150,000,000 150,000,000
Common stock, par value     $ 0.01 $ 0.01
Preferred stock, shares authorized     5,000,000 5,000,000
Preferred stock, par value     $ 0.01 $ 0.01
Preferred stock, shares issued     0 0