Income Taxes	6 Months Ended
Jun. 30, 2017
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 2017 was 35.5% compared to 36.0% in the second quarter of 2016. The provision for income taxes as a percentage of earnings before income taxes for the first half of 2017 was 34.9% compared to 36.1% in the first half of 2016. 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.

Income Taxes

6 Months Ended

Jun. 30, 2017

The provision for income taxes as a percentage of earnings before income taxes for the second quarter of 2017 was 35.5% compared to 36.0% in the second quarter of 2016. The provision for income taxes as a percentage of earnings before income taxes for the first half of 2017 was 34.9% compared to 36.1% in the first half of 2016. 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.