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Net Income Per Share (Options and Warrants Excluded From the Calculation) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Options excluded from diluted earnings per share 2.9 1.5
Warrants excluded from diluted earnings per share 6.3 6.3
Exercise price of excluded warrants $ 7.50 $ 7.50
Maximum [Member]
    
Exercise price of excluded options $ 14.28 $ 14.28
Minimum [Member]
    
Exercise price of excluded options $ 3.72 $ 5.52