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Income Taxes
6 Months Ended
Jun. 30, 2014
Income Tax Disclosure [Abstract]  
Income Taxes
Income Taxes

The provision for income taxes as a percentage of earnings before income taxes for the second quarter of 2014 was 36.6% compared to 36.1% in the second quarter of 2013. The provision for income taxes as a percentage of earnings before income taxes for the first half of 2014 was 36.9% compared to 35.8% in the first half of 2013. Interim provisions are tied to an estimate of the overall annual rate which can vary due to state taxes, the relationship of foreign and domestic earnings, and production credits available. These items cause variations between periods.