Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Income Taxes	5. Income Taxes The effective income tax rate for the three and nine months ended September 30, 2013, was 35.3% and 35.1%, respectively. Total income tax expense for the three and nine months ended September 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 nine months ended September 30, 2012, was 34.7% and 36.3%, respectively. Total income tax expense 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 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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