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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2022
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table presents the components of basic and diluted earnings (loss) per share (in thousands, except per share amounts):
|  |  |  | Three Months Ended March 31, |
|  |  |  |  |  | 2022 |  |  | 2021 |
Net earnings (loss) attributable to Kirby |  |  |  |  |  | $ | 17,434 |  |  | $ | (3,375 | )
Undistributed earnings allocated to restricted shares |  |  | (3 | ) |  |  | — |
Earnings (loss) available to Kirby common stockholders – basic |  |  | 17,431 |  |  |  | (3,375 | )
Undistributed earnings allocated to restricted shares |  |  | 3 |  |  |  | — |
Undistributed earnings reallocated to restricted shares |  |  | (3 | ) |  |  | — |
Earnings (loss) available to Kirby common stockholders – diluted |  | $ | 17,431 |  |  | $ | (3,375 | )
Shares outstanding: |  |  |  |  |  |
Weighted average common stock issued and outstanding |  |  | 60,182 |  |  |  | 60,074 |
Weighted average unvested restricted stock |  |  | (9 | ) |  |  | (58 | )
Weighted average common stock outstanding – basic |  |  | 60,173 |  |  |  | 60,016 |
Dilutive effect of stock options and restricted stock units |  |  | 290 |  |  |  | — |
Weighted average common stock outstanding – diluted |  |  | 60,463 |  |  |  | 60,016 |
Net earnings (loss) per share attributable to Kirby common stockholders: |  |  |  |  |  |
Basic |  | $ | 0.29 |  |  | $ | (0.06 | )
Diluted |  | $ | 0.29 |  |  | $ | (0.06 | )

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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=124432515&loc=d3e3550-109257 + Details
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