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Income Taxes (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Rate
Jun. 30, 2016
Rate
Jun. 30, 2017
Rate
Jun. 30, 2016
Rate
Income Tax Disclosure [Abstract]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 11.80% 12.30% 11.40% 14.50%