Quarterly report pursuant to Section 13 or 15(d)

Income Taxes Income Taxes

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Income Taxes Income Taxes
9 Months Ended
Sep. 30, 2013
Income Tax Disclosure [Abstract]  
Income Taxes
Note 3. Income Taxes

Our effective tax rate generally exceeds the federal statutory rate of 35% due to the impact of state taxes, and, to a lesser extent, certain other non-deductible items.  For the three and nine months ended September 30, 2013, our effective tax rate was 36.9% and 37.3%, respectively, as compared to 34.9% and 37.8%, respectively, for the comparable periods of 2012.
 
Our effective tax rate can also be affected by the utilization of tax credits and discrete tax adjustments.  Our third quarter and year-to-date effective tax rates in 2013 included favorable discrete tax adjustments of $1.6 million and $3.2 million, respectively.  These adjustments were the result of tax credits provided by the American Taxpayer Relief Act of 2012 for the use of alternative fuel in our operations and the utilization of other additional federal and state tax credits.  Our third quarter and year-to-date effective tax rates in 2012 included favorable discrete tax adjustments of $2.7 million, all of which were recorded in the third quarter of 2012, primarily due to the utilization of certain state tax credits.