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Income Taxes (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Taxes        
Effective tax rate (as a percent) 25.00% 22.90% 25.00% 23.70%
Income tax at U.S. federal statutory tax rate (as a percent)     21.00% 21.00%