Income Taxes

3 Months Ended

Mar. 31, 2012

Income Taxes [Abstract]

Income Taxes

Note 10. Income Taxes

Our effective income tax rate was 31.7% and 31.2% for the three months ended March 31, 2012 and 2011, respectively. The increase in our effective income tax rate for the three months ended March 31, 2012 compared to the same period of the prior year was due primarily to federal research and development tax incentives that were not available during the three months ended March 31, 2012, but were available during the three months ended March 31, 2011. This increase was partly offset by a decrease in the effective income tax rates in international jurisdictions in which we operate.