Income Taxes

3 Months Ended

Mar. 31, 2013

Income Tax Disclosure [Abstract]

Income Taxes

9. Income Taxes

The effective income tax rate was 38.7% for the three months ended March 31, 2013, compared with 38.0% for the three months ended March 31, 2012. In determining the quarterly provision for income taxes, the Company used an estimated annual effective tax rate, which was based on expected annual income, statutory tax rates, and its best estimate of non-deductible and non-taxable items of income and expense. Income tax expense varies from the amount computed by applying the federal corporate income tax rate of 35.0% to income before income taxes primarily due to state income taxes, net of federal income tax effect, and adjustments for permanent differences.