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Income Taxes - Additional Information (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Tax Disclosure [Abstract]        
Effective income tax rate 35.10% 33.60% 35.70% 38.10%
U.S. statutory rate 35.00%   35.00%