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Net Income Per Share of Common Stock
 9 Months Ended
Sep. 30, 2012
Net Income Per Share of Common Stock [Abstract]  
Net Income Per Share of Common Stock
Net Income Per Share of Common Stock
 
Basic net income per share is based on the weighted average number of shares of common stock outstanding during the period, which does not include unvested restricted stock subject to forfeiture. Diluted net income per share reflects: a) the potential dilution assuming shares of common stock were issued upon the exercise of outstanding in-the-money options and the proceeds thereof were used to purchase shares of the Company’s common stock at the average market price during the period, and b) the vesting of granted nonvested restricted stock awards for which the assumed proceeds upon vesting are deemed to be the amount of compensation cost not yet recognized attributable to future services using the treasury stock method, to the extent dilutive. For both the three- and nine-month periods ended September 30, 2012, options to purchase approximately 99,000 shares of common stock have been excluded in the calculation of diluted income per share as compared with 19,000 and 169,000 shares that were excluded for the three- and nine-month periods ended September 30, 2011, respectively, as the result would have been antidilutive. For the three- and nine-month periods ended September 30, 2012 and 2011, all unvested restricted stock awards were dilutive.