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Income Taxes
3 Months Ended
Mar. 31, 2014
Income Taxes
10. Income Taxes

The effective income tax rates for the three months ended March 31, 2014 and 2013 were 32.1% and 31.9%, respectively. The effective tax rate in 2014 was favorably impacted by the tax benefit associated with the anticipated year-over-year increase of the Domestic Production Activity (Internal Revenue Code Section 199) deduction. The effective tax rate in 2013 was favorably impacted by the tax benefit associated with the extension of the U.S. research and development credit under the American Taxpayer Relief Act of 2012.

It is reasonably possible that, within the next 12 months, total unrecognized tax benefits may decrease in the range of $2 million to $3 million, primarily as a result of the conclusion of pending U.S. federal, state and foreign income tax proceedings.