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Earnings per share | 12 Months Ended
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Dec. 31, 2023
Earnings Per Share [Abstract] |
Earnings per share | Earnings per share Basic earnings per 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 the 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 earnings per share computations is as follows (in thousands, except per share amounts):
|  | Twelve Months Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Numerator |  |  |  |  |  |
Net income |  | $ | 281,594 |  |  | $ | 202,129 |  |  | $ | 402,710 |
Denominator |  |  |  |  |  |
Weighted average common shares outstanding for basic earnings per share |  | 131,927 |  |  | 136,844 |  |  | 140,646 |
Dilutive potential common stock outstanding |  |  |  |  |  |
Stock options |  | 1,824 |  |  | 2,265 |  |  | 2,737 |
RSUs, PSUs and ESPP |  | 388 |  |  | 422 |  |  | 555 |
Convertible Notes |  | 58 |  |  | 1,077 |  |  | 2,858 |
Weighted average common shares outstanding for diluted earnings per share |  | 134,197 |  |  | 140,608 |  |  | 146,796 |
Earnings per share |  |  |  |  |  |
Basic |  | $ | 2.13 |  |  | $ | 1.48 |  |  | $ | 2.86 |
Diluted |  | $ | 2.10 |  |  | $ | 1.44 |  |  | $ | 2.74 |
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):
|  | Twelve Months Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Anti-dilutive securities (1) |  | 27.8 |  |  | 20.7 |  |  | 13.8 |
(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.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//260/tableOfContent Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-3 + Details
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