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Income Taxes Effective Tax Rates (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
US Federal Effective Tax Rate     35.00%  
Effective Income Tax Rate, Continuing Operations 24.70% (0.20%) 25.90% 13.10%