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Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2013
Income Tax Disclosure [Abstract]
Income Taxes	7 Income Taxes The provision for income taxes as a percentage of earnings before income taxes for the second quarter of 2013 was 36.1% compared to 33.1% in the second quarter of 2012. The provision for income taxes as a percentage of earnings before income taxes for the first half of 2013 was 35.8% compared to 35.1% in the first half of 2012. The effective tax rate included $0.1 million of 2012 research and development credits in the first quarter of 2013 as a result of tax legislation enacted at that time. The first half of 2012 included a $0.4 million decrease in tax expense due to the recognition of favorable state income tax audit outcomes for prior periods.

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.

+ References

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