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Income Taxes (Details Textual) (USD $)
In Billions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Income Taxes (Textual) [Abstract]          
Federal statutory rate 35.00% 35.00% 35.00% 35.00%  
Net deferred tax liability $ 1.4   $ 1.4   $ 1.1