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Income Taxes (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes (Textual) [Abstract]      
Net operating loss carry forwards $ 1,270,000,000    
Interest and penalties on unrecognized tax benefits $ 1,800,000 $ 1,200,000 $ 8,500,000