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Income Taxes
6 Months Ended
Jun. 30, 2013
Income Tax Disclosure [Abstract]  
Income Taxes
Income Taxes 

The Provision for income taxes reflects an estimated annual tax rate of 27 percent for the second quarters of both 2013 and 2012. The 2013 estimated annual tax rate of 27 percent excludes a benefit of $7 million reflecting the impact of the American Taxpayer Relief Act.