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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2021
Earnings Per Share [Abstract] |
Earnings Per Share | The following table presents the components of basic and diluted earnings (loss) per share (in thousands, except per share amounts):
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Net earnings (loss) attributable to Kirby |  | $ | (246,954 | ) |  | $ | (272,546 | ) |  | $ | 142,347 |
Undistributed earnings allocated to restricted shares |  |  | — |  |  |  | — |  |  |  | (369 | )
Earnings (loss) available to Kirby common stockholders — basic |  |  | (246,954 | ) |  |  | (272,546 | ) |  |  | 141,978 |
Undistributed earnings allocated to restricted shares |  |  | — |  |  |  | — |  |  |  | 369 |
Undistributed earnings reallocated to restricted shares |  |  | — |  |  |  | — |  |  |  | (369 | )
Earnings (loss) available to Kirby common stockholders — diluted |  | $ | (246,954 | ) |  | $ | (272,546 | ) |  | $ | 141,978 |
Shares outstanding: |  |  |  |  |  |  |  |  |
Weighted average common stock issued and outstanding |  |  | 60,099 |  |  |  | 60,021 |  |  |  | 59,905 |
Weighted average unvested restricted stock |  |  | (46 | ) |  |  | (109 | ) |  |  | (155 | )
Weighted average common stock outstanding — basic |  |  | 60,053 |  |  |  | 59,912 |  |  |  | 59,750 |
Dilutive effect of stock options and restricted stock units |  |  | — |  |  |  | — |  |  |  | 159 |
Weighted average common stock outstanding — diluted |  |  | 60,053 |  |  |  | 59,912 |  |  |  | 59,909 |
Net earnings (loss) per share attributable to Kirby common stockholders: |  |  |  |  |  |  |  |  |
Basic |  | $ | (4.11 | ) |  | $ | (4.55 | ) |  | $ | 2.38 |
Diluted |  | $ | (4.11 | ) |  | $ | (4.55 | ) |  | $ | 2.37 |

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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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