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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2022
Earnings Per Share [Abstract] |
Schedule of Loss Per Share | The following table presents the components of basic and diluted earnings (loss) per share (in thousands, except per share amounts):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Net earnings (loss) attributable to Kirby |  | $ | 39,091 |  |  | $ | (264,730 | ) |  | $ | 84,982 |  |  | $ | (257,915 | )
Undistributed earnings allocated to restricted shares |  |  | (18 | ) |  |  | — |  |  |  | (27 | ) |  |  | — |
Earnings (loss) available to Kirby common stockholders – basic |  |  | 39,073 |  |  |  | (264,730 | ) |  |  | 84,955 |  |  |  | (257,915 | )
Undistributed earnings allocated to restricted shares |  |  | 18 |  |  |  | — |  |  |  | 27 |  |  |  | — |
Undistributed earnings reallocated to restricted shares |  |  | (18 | ) |  |  | — |  |  |  | (27 | ) |  |  | — |
Earnings (loss) available to Kirby common stockholders – diluted |  | $ | 39,073 |  |  | $ | (264,730 | ) |  | $ | 84,955 |  |  | $ | (257,915 | )
Shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common stock issued and outstanding |  |  | 59,923 |  |  |  | 60,109 |  |  |  | 60,107 |  |  |  | 60,095 |
Weighted average unvested restricted stock |  |  | (27 | ) |  |  | (47 | ) |  |  | (19 | ) |  |  | (51 | )
Weighted average common stock outstanding – basic |  |  | 59,896 |  |  |  | 60,062 |  |  |  | 60,088 |  |  |  | 60,044 |
Dilutive effect of stock options and restricted stock units |  |  | 286 |  |  |  | — |  |  |  | 281 |  |  |  | — |
Weighted average common stock outstanding – diluted |  |  | 60,182 |  |  |  | 60,062 |  |  |  | 60,369 |  |  |  | 60,044 |
Net earnings (loss) per share attributable to Kirby common stockholders: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.65 |  |  | $ | (4.41 | ) |  | $ | 1.41 |  |  | $ | (4.30 | )
Diluted |  | $ | 0.65 |  |  | $ | (4.41 | ) |  | $ | 1.41 |  |  | $ | (4.30 | )

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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