Note 8 – Net Income Per Common Share

Basic net income per common share is computed by dividing our net income attributable to common stockholders by the weighted average number of shares of common stock outstanding during the period. Diluted net income per common share is computed by dividing our net income attributable to common stockholders by the sum of the weighted average number of shares of common stock outstanding during the period plus the potential dilutive effects of stock options, unvested RSUs and PSUs, shares of common stock expected to be issued under our ESPP, Convertible Notes and Series E Preferred Stock outstanding during the period.

Net income attributable to common stockholders represents our net income less Series E Preferred Stock accumulated dividends and the impact of Series E Preferred Stock redemption.

The potential dilutive effect of stock options, unvested RSUs and PSUs, and shares of common stock expected to be issued under our ESPP during the period are calculated in accordance with the treasury stock method, but are excluded if their effect is anti-dilutive. The potential dilutive effect of our Convertible Notes and Series E Preferred Stock outstanding during the period are calculated using the if-converted method assuming the conversion of our Convertible Notes and Series E Preferred Stock as of the earliest period reported or at the date of issuance, if later, but are excluded if their effect is anti-dilutive. A reconciliation of the numerators and the denominators of the basic and dilutive net income per common share computations are as follows (in thousands, except per share amounts): 

The following table presents the potential dilutive securities excluded from the calculation of diluted net income per common share for the periods presented as the effect of their inclusion would have been anti-dilutive (in thousands):