Income Taxes Income Taxes	9 Months Ended
Income Taxes Income Taxes	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.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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