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Income Taxes (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Taxes        
Effective tax rate (as a percent) 25.70% 32.70% 32.50% 31.90%
U.S. federal statutory rate (as a percent)     35.00%