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Income Taxes (Summary of Effective Income Tax Rates) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]        
Effective tax rate 21.10% 37.50% 21.50% 36.20%