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Earnings Per Share
 6 Months Ended
Jun. 30, 2011
Earnings Per Share  
Earnings Per Share

8. Earnings Per Share

Basic earnings per share ("EPS") excludes dilution and is computed by dividing net income (loss) attributable to common stockholders by the weighted-average number of common shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock using the treasury stock method. Potentially dilutive securities (consisting of options and restricted stock units ("RSUs") and employee stock purchase plan ("ESPP") withholdings using the treasury stock method) are excluded from the diluted EPS computation in loss periods and when the applicable exercise price is greater than the market price on the period end date as their effect would be anti-dilutive.

For the three and six months ended June 30, 2011, basic and diluted weighted-average common shares outstanding were 32,048,141 and 31,978,771, respectively. During these same periods, weighted-average options and RSUs shares to acquire a total of 4,792,540 and 3,953,808 shares of common stock, respectively, were outstanding but not included in the computation of diluted earnings per share as their effect was anti-dilutive.

For the three and six months ended June 30, 2010, basic and diluted weighted-average common shares outstanding were 31,438,514 and 31,312,416, respectively. During these same periods, weighted-average options RSUs, and unissued ESPP shares to acquire a total of 4,898,809 and 4,337,627 shares of common stock, respectively, were outstanding but not included in the computation of diluted earnings per share as their effect was anti-dilutive.