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Income Taxes	3 Months Ended
	Mar. 31, 2013
Income Taxes [Abstract]
Income Taxes	(7) Income Taxes The Company’s effective tax rate was approximately 39% and 30% for the three months ended March 31, 2012 and 2013, respectively, which differ from the federal statutory rate of 34% due to the effect of state income taxes, certain expenses that are not deductible for tax purposes, and changes in the valuation allowance for certain deferred tax assets which management has determined, more likely than not, that such losses will not be utilized. The effective tax rate for the three months ended March 31, 2013, also reflects a $0.3 million decrease from a change to the Company’s state tax effective rate.

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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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