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Income Taxes
6 Months Ended
Jun. 30, 2011
Income Taxes [Abstract]  
Income Taxes
(12)  Income Taxes

The company's effective tax rates were 15.7% and 39.1% for the six months ended June 30, 2011 and 2010, respectively.  The lower tax rate in 2011 primarily resulted from a favorable income tax adjustment of $7.7 million recorded in the second quarter of 2011, pertaining to the company's election to claim extraterritorial income ("ETI") exclusions related to prior-year export activity.  The tax rate in 2011 also includes the effect of the federal research and development tax credit that was reinstated in December 2010.