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Income Taxes (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Tax Disclosure [Abstract]        
Provision for income taxes as a percentage of earnings before income taxes 37.50% 34.90% 35.90% 36.00%