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Income Taxes
9 Months Ended
Sep. 30, 2014
Income Tax Disclosure [Abstract]  
Income taxes
Income Taxes

The effective tax rate was 30.4% in the third quarter of 2014 compared to 31.5% for same quarter of 2013. Effective tax rates differ from statutory federal income tax rates, primarily due to the domestic manufacturing deduction, provisions for state and local income taxes and permanent tax differences. The decrease in the effective tax rate from the third quarter of 2014 compared to the third quarter of 2013 is primarily due to incremental research and development tax credits related to the 2013 calendar year in the amount of $1.8 million.