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Income Taxes
6 Months Ended
Jun. 30, 2013
Income Taxes [Abstract]  
Income Taxes
10. Income Taxes

The effective income tax rates for the six months ended June 30, 2013 and 2012 were 37.5% and 39.2%, 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 in 2013.