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Income Taxes
9 Months Ended
Sep. 30, 2012
Income Taxes [Abstract]  
Income Taxes
(12)  Income Taxes

The company’s effective tax rates were 35.9% and 19.2% for the nine months ended September 30, 2012 and 2011, respectively.  The tax rate in 2011 included a favorable income tax adjustment of $7.7 million pertaining to the company’s election to claim extraterritorial income exclusions related to export activities in prior years.  In addition, the tax rate in 2011 reflected the effect of federal research and development tax credits that are not expected to be available to the company in 2012.