Net Income per Weighted-Average Common Share

6 Months Ended

Jun. 30, 2011

Net Income per Weighted-Average Common Share [Abstract]

Net Income per Weighted-Average Common Share

5. Net Income per Weighted-Average Common Share

     The computations of basic and diluted net income per weighted-average common share for the three and six-month periods ended June 30, 2011, and 2010, are based on the Company’s weighted-average shares of common stock and potentially dilutive securities outstanding.

     Potentially dilutive securities are calculated in accordance with the treasury stock method, which assumes that the proceeds from the exercise of all stock options are used to repurchase the Company’s common stock at the average market price for the period. As of June 30, 2011, and 2010, there were stock options to purchase 2,038,787 and 2,486,862 shares, respectively, of the Company’s common stock outstanding, of which stock options to purchase 869,397 and 1,356,889 shares of the Company’s common stock, respectively, were excluded from the computation of diluted net income per weighted-average common share for the quarters ended June 30, 2011, and 2010, respectively, either because the stock options’ exercise prices were greater than the average market price of the Company’s common shares or assumed repurchases from proceeds from the stock options’ exercise were antidilutive.