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Income Taxes Effective Tax Rates (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
US Federal Effective Tax Rate     35.00% 35.00%
Effective Income Tax Rate, Continuing Operations 15.40% 1.20% 22.20% 3.60%