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Income Taxes
3 Months Ended
Mar. 31, 2012
Income Taxes [Abstract]  
Income Taxes
(3) Income Taxes

The provisions for income taxes for the 2012 and 2011 thirteen-week periods were based on an estimated full year combined effective income tax rates of approximately 36.7% and 38.2%, respectively, which was higher than the statutory federal income tax rate primarily as a result of state taxes, the meals and entertainment exclusion and non-deductible stock-based compensation. The decrease in the effective income tax rate in the 2012 thirteen-week period compared to the 2011 thirteen-week period was due to income tax benefits recognized in 2012 upon the disqualifying disposition of the Company's common stock by employees who obtained the stock through recent exercises of incentive stock options.