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Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The provision for income taxes as a percentage of earnings before income taxes for the third quarter of 2013 was 33.5% compared to 35.9% in the third quarter of 2012. The provision for income taxes as a percentage of earnings before income taxes for the first three quarters of 2013 was 34.7% compared to 35.4% in the first three quarters of 2012. The decrease for the quarter ended September 30, 2013 was due primarily to the recognition of additional 2012 research and development credits identified in the third quarter of 2013, as well as the reversal of reserves for uncertain tax positions for tax years that expired. The decrease for the first nine months of 2013 was mainly due to recognition of 2012 research and development credits as a result of tax legislation enacted early in 2013 and the reversal of prior period reserves.

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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