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Net Income per share
 12 Months Ended
Dec. 31, 2022
Earnings Per Share [Abstract]  
Net Income per share Net Income per share
Basic net income per common share is computed by dividing net income for the period by the weighted average number of common shares outstanding during the period, without consideration for common stock equivalents. Outstanding stock options, unvested RSAs, unvested RSUs, unvested PSUs, common shares expected to be issued under our ESPP and the Convertible Notes are considered common stock equivalents and are only included in the calculation of diluted earnings per common share when net income is reported and their effect is dilutive.
Potentially dilutive common shares issuable upon vesting of stock options, RSAs, RSUs and PSUs are determined using the average share price for each period under the treasury stock method. Potentially dilutive common shares issuable upon conversion of our Convertible Notes are determined using the if-converted method. Since we have committed to settle the principal amount of the Convertible Notes in cash upon conversion only, the number of shares for the conversion spread will be included as a dilutive common stock equivalent.
A reconciliation of the numerators and the denominators of the basic and diluted net income per common share computations is as follows (in thousands, except per share amounts):
Twelve Months Ended
December 31,
 202220212020
Numerator:
Net income$202,129 $402,710 $129,085 
Denominator:
Weighted average common shares outstanding for basic net income per share136,844 140,646 136,206 
Dilutive potential common stock outstanding:
Stock Options2,265 2,737 2,317 
RSAs, RSUs, PSUs and ESPP422 555 627 
Convertible Notes1,077 2,858 2,313 
Weighted average common shares outstanding for diluted net income per share140,608 146,796 141,463 
Net income per share:
Basic$1.48 $2.86 $0.95 
Diluted$1.44 $2.74 $0.91 
Shares which have been excluded from the calculation of diluted net income per common share because their effect was anti-dilutive, include the following (shares in millions):
Twelve Months Ended
December 31,
 202220212020
Anti-dilutive securities (1)
20.7 13.8 18.6 
(1). The anti-dilutive securities include outstanding stock options, unvested RSUs, unvested PSUs, common shares expected to be issued under our ESPP and Convertible Notes.