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Income Taxes	3 Months Ended
	Mar. 31, 2013
Income Taxes [Abstract]
Income Taxes	9. Income Taxes The effective income tax rates for the quarters ended March 31, 2013 and 2012 were 36.2% and 38.8%, respectively.  The decrease in the effective income tax rate year-over-year is primarily due to the lower tax rate of a foreign subsidiary acquired during the fourth quarter of 2012 and the reinstatement of the federal research and development tax credit.

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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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