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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
Basic and Diluted Loss per Share | The following table presents the components of basic and diluted loss per share (in thousands, except per share amounts):
|  | Three Months Ended March 31, |
|  | 2021 |  |  | 2020 |
Loss attributable to Kirby common stockholders – basic and diluted |  | $ | (3,375 | ) |  | $ | (347,241 | )
Shares outstanding: |  |  |  |  |  |  |  |
Weighted average common stock issued and outstanding |  |  | 60,074 |  |  |  | 59,983 |
Weighted average unvested restricted stock |  |  | (58 | ) |  |  | (100 | )
Weighted average common stock outstanding – basic and diluted |  |  | 60,016 |  |  |  | 59,883 |
Net loss per share attributable to Kirby common stockholders: |  |  |  |  |  |  |  |
Basic |  | $ | (0.06 | ) |  | $ | (5.80 | )
Diluted |  | $ | (0.06 | ) |  | $ | (5.80 | )

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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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