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5. Income Taxes	9 Months Ended
5. Income Taxes	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Income Taxes	Our effective tax rate for the third quarter of 2014 was 33.1 percent, compared with 30.4 percent for the third quarter of 2013. Our effective tax rate for the first nine months of 2014 was 34.2 percent, compared with 32.0 percent for the first nine months of 2013. The lower effective tax rates for both the third quarter and first nine months of 2013 benefited from the extension of the federal research tax credit provisions included in the American Taxpayer Relief Act of 2012, which was signed into law on January 2, 2013. Credits from tax incentives for research and development expenditures in the full year 2012 and first nine months of 2013 were included in the calculation of income taxes for the first nine months of 2013. The law has not been extended to 2014, and the absence of the federal research and development tax credits for 2014 resulted in an increase in our effective tax rate in the third quarter and first nine months of 2014. Additionally, our effective tax rate in the third quarter and first nine months of 2014 increased as a result of state income tax law changes.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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