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Income Taxes
6 Months Ended
Jun. 30, 2013
Income Tax Disclosure [Abstract]  
Income Taxes
5. Income Taxes

The effective income tax rate for the three and six months ended June 30, 2013, was 35.1%. Total income tax expense for the three and six months ended June 30, 2013, differed from amounts computed by applying the U.S. federal statutory tax rates to pre-tax income due primarily to state taxes and the impact of permanent differences between book and taxable income.

The effective income tax rate for the three and six months ended June 30, 2012, was 35.8% and 35.9%, respectively. Total income tax expense for the three and six months ended June 30, 2012, differed from amounts computed by applying the U.S. federal statutory tax rates to pre-tax income due primarily to state taxes and the impact of permanent differences between book and taxable income.