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Income Taxes (Details)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Tax Disclosure [Abstract]    
Effective tax rate (in hundredths) 28.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations 27.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations