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Income Taxes (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Income Taxes [Abstract]          
Gross unrecognized tax benefits $ 16,400,000   $ 16,400,000   $ 16,400,000
Federal income tax expense $ 0 $ 0 $ 0 $ 0