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Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes. Our overall effective tax rate for the three months ended March 31, 2014 was 27.4% compared to (217.2)% for the three months ended March 31, 2013. Our provision for income taxes for the three months ended March 31, 2014 totaled $1.1 million of expense compared to $459,000 of benefit for the corresponding period of 2013. This fluctuation was primarily driven by an increase in income before tax in 2014 and a discrete tax benefit of approximately $500,000 recognized during the first quarter of 2013 associated with the 2012 federal research and development credit. On January 2, 2013, the American Taxpayer Relief Act of 2012, which included a reinstatement of the federal research and development credit for the tax year ended December 31, 2012, was signed into law. As a result, we recognized the retroactive benefit of the federal research and development credit for 2012 as a discrete item in the first quarter of 2013, the period in which the reinstatement was enacted.

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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