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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2021
Earnings Per Share [Abstract] |
Basic and Diluted 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, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Net earnings (loss) attributable to Kirby |  | $ | (264,730 | ) |  | $ | 27,489 |  |  | $ | (257,915 | ) |  | $ | (294,750 | )
Undistributed earnings allocated to restricted shares |  |  | — |  |  |  | (57 | ) |  |  | — |  |  |  | — |
Earnings (loss) available to Kirby common stockholders – basic |  |  | (264,730 | ) |  |  | 27,432 |  |  |  | (257,915 | ) |  |  | (294,750 | )
Undistributed earnings allocated to restricted shares |  |  | — |  |  |  | 57 |  |  |  | — |  |  |  | — |
Undistributed earnings reallocated to restricted shares |  |  | — |  |  |  | (57 | ) |  |  | — |  |  |  | — |
Earnings (loss) available to Kirby common stockholders – diluted |  | $ | (264,730 | ) |  | $ | 27,432 |  |  | $ | (257,915 | ) |  | $ | (294,750 | )
Shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common stock issued and outstanding |  |  | 60,109 |  |  |  | 60,038 |  |  |  | 60,095 |  |  |  | 60,015 |
Weighted average unvested restricted stock |  |  | (47 | ) |  |  | (123 | ) |  |  | (51 | ) |  |  | (112 | )
Weighted average common stock outstanding – basic |  |  | 60,062 |  |  |  | 59,915 |  |  |  | 60,044 |  |  |  | 59,903 |
Dilutive effect of stock options and restricted stock units |  |  | — |  |  |  | 16 |  |  |  | — |  |  |  | — |
Weighted average common stock outstanding – diluted |  |  | 60,062 |  |  |  | 59,931 |  |  |  | 60,044 |  |  |  | 59,903 |
Net earnings (loss) per share attributable to Kirby common stockholders: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | (4.41 | ) |  | $ | 0.46 |  |  | $ | (4.30 | ) |  | $ | (4.92 | )
Diluted |  | $ | (4.41 | ) |  | $ | 0.46 |  |  | $ | (4.30 | ) |  | $ | (4.92 | )

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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 http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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