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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2023
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 June 30, |  |  | Six Months Ended June 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Net earnings attributable to Kirby |  | $ | 57,367 |  |  | $ | 28,457 |  |  | $ | 98,065 |  |  | $ | 45,891 |
Undistributed earnings allocated to restricted shares |  |  | (22 | ) |  |  | (10 | ) |  |  | (21 | ) |  |  | (11 | )
Earnings available to Kirby common stockholders – basic |  |  | 57,345 |  |  |  | 28,447 |  |  |  | 98,044 |  |  |  | 45,880 |
Undistributed earnings allocated to restricted shares |  |  | 22 |  |  |  | 10 |  |  |  | 21 |  |  |  | 11 |
Undistributed earnings reallocated to restricted shares |  |  | (22 | ) |  |  | (10 | ) |  |  | (21 | ) |  |  | (11 | )
Earnings available to Kirby common stockholders – diluted |  | $ | 57,345 |  |  | $ | 28,447 |  |  | $ | 98,044 |  |  | $ | 45,880 |
Shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common stock issued and outstanding |  |  | 59,829 |  |  |  | 60,222 |  |  |  | 59,905 |  |  |  | 60,202 |
Weighted average unvested restricted stock |  |  | (23 | ) |  |  | (20 | ) |  |  | (13 | ) |  |  | (14 | )
Weighted average common stock outstanding – basic |  |  | 59,806 |  |  |  | 60,202 |  |  |  | 59,892 |  |  |  | 60,188 |
Dilutive effect of stock options and restricted stock units |  |  | 279 |  |  |  | 265 |  |  |  | 287 |  |  |  | 277 |
Weighted average common stock outstanding – diluted |  |  | 60,085 |  |  |  | 60,467 |  |  |  | 60,179 |  |  |  | 60,465 |
Net earnings per share attributable to Kirby common stockholders: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.96 |  |  | $ | 0.47 |  |  | $ | 1.64 |  |  | $ | 0.76 |
Diluted |  | $ | 0.95 |  |  | $ | 0.47 |  |  | $ | 1.63 |  |  | $ | 0.76 |

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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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