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Income Taxes (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Tax Disclosure [Abstract]        
Provision for income taxes as a percentage of earnings before income taxes 34.90% 33.50% 36.00% 34.70%