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Earnings Per Share
 3 Months Ended
Mar. 31, 2013
Earnings Per Share [Abstract]  
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.

As of March 31, 2013 and 2012, basic and diluted weighted-average common shares outstanding were 33,716,594 and 32,295,942, respectively. As of March 31, 2013 and 2012, weighted-average options, RSUs, and ESPP shares to acquire a total of 6,027,732 and 6,001,156 shares of common stock, respectively, were outstanding but not included in the computation of diluted earnings per share as their effect was anti-dilutive.