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Income Taxes (Summary of Effective Income Tax Rates) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income Tax Disclosure [Abstract]        
Effective tax rate (percent) 36.60% 36.20% 37.70% 37.60%