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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2023
Earnings Per Share [Abstract] |
Computation of earnings per share and reconciliation of basic and diluted weighted average common shares outstanding | The table below presents the computation of earnings per share, including the reconciliation of basic and diluted weighted average shares outstanding (in thousands, except per share data):
|  | Year Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Net income |  | $ | 523,229 |  |  | $ | 748,462 |  |  | $ | 650,624 |
Amounts allocated to participating securities |  | (2,771) |  |  | (4,151) |  |  | (4,321) |
Net income attributable to common stockholders |  | $ | 520,458 |  |  | $ | 744,311 |  |  | $ | 646,303 |
Weighted average common shares outstanding: |  |  |  |  |  |
Basic |  | 38,704 |  |  | 39,409 |  |  | 39,876 |
Effect of dilutive securities: |  |  |  |  |  |
Stock options and employee stock purchase plan |  | 293 |  |  | 397 |  |  | 604 |
Diluted |  | 38,997 |  |  | 39,806 |  |  | 40,480 |
Earnings per share attributable to common stockholders: |  |  |  |  |  |
Basic |  | $ | 13.45 |  |  | $ | 18.89 |  |  | $ | 16.21 |
Diluted |  | $ | 13.35 |  |  | $ | 18.70 |  |  | $ | 15.97 |
Anti-dilutive stock options excluded from diluted earnings per share computations (1) |  | 64 |  |  | 34 |  |  | 1 |
(1)Since these options have exercise prices that are higher than the average market prices of our common stock, including them in the calculation would have an anti-dilutive effect on earnings per share.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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