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Net Income per share
 3 Months Ended
Mar. 31, 2023
Earnings Per Share [Abstract]  
Earnings per share per share
Basic earnings 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 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, 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 earning per common share computations is as follows (in thousands, except per share amounts):
Three Months Ended
 March 31,
 20232022
Numerator
Net income$39,615 $60,108 
Denominator
Weighted average common shares outstanding for basic earnings per share135,027 137,658 
Dilutive potential common stock outstanding
Stock Options2,173 2,043 
RSUs, PSUs and ESPP468 317 
Convertible Notes232 1,259 
Weighted average common shares outstanding for diluted earnings per share137,900 141,277 
Earnings per share:
Basic$0.29 $0.44 
Diluted$0.29 $0.43 
Shares which have been excluded from the calculation of diluted earnings per common share because their effect was anti-dilutive, include the following (shares in millions):
Three Months Ended
 March 31,
 20232022
Anti-dilutive securities (1)
26.2 15.4 
(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