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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2024
Earnings Per Share [Abstract] |
Schedule of Loss Per Share | The following table presents the components of basic and diluted earnings per share (in thousands, except per share amounts):
|  | Three Months Ended March 31, |
|  | 2024 |  |  | 2023 |
Net earnings attributable to Kirby |  | $ | 70,068 |  |  | $ | 40,698 |
Undistributed earnings allocated to restricted shares |  |  | (1 | ) |  |  | (2 | )
Earnings available to Kirby common stockholders – basic |  |  | 70,067 |  |  |  | 40,696 |
Undistributed earnings allocated to restricted shares |  |  | 1 |  |  |  | 2 |
Undistributed earnings reallocated to restricted shares |  |  | (1 | ) |  |  | (2 | )
Earnings available to Kirby common stockholders – diluted |  | $ | 70,067 |  |  | $ | 40,696 |
Shares outstanding: |  |  |  |  |  |
Weighted average common stock issued and outstanding |  |  | 58,473 |  |  |  | 59,981 |
Weighted average unvested restricted stock |  |  | (1 | ) |  |  | (3 | )
Weighted average common stock outstanding – basic |  |  | 58,472 |  |  |  | 59,978 |
Dilutive effect of stock options and restricted stock units |  |  | 347 |  |  |  | 294 |
Weighted average common stock outstanding – diluted |  |  | 58,819 |  |  |  | 60,272 |
Net earnings per share attributable to Kirby common stockholders: |  |  |  |  |  |
Basic |  | $ | 1.20 |  |  | $ | 0.68 |
Diluted |  | $ | 1.19 |  |  | $ | 0.68 |

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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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