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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 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 June 30, |  |  | Six months ended June 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Net earnings (loss) attributable to Kirby |  | $ | 10,190 |  |  | $ | 25,002 |  |  | $ | 6,815 |  |  | $ | (322,239 | )
Undistributed earnings allocated to restricted shares |  |  | (8 | ) |  |  | (46 | ) |  |  | (6 | ) |  |  | — |
Earnings (loss) available to Kirby common stockholders – basic |  |  | 10,182 |  |  |  | 24,956 |  |  |  | 6,809 |  |  |  | (322,239 | )
Undistributed earnings allocated to restricted shares |  |  | 8 |  |  |  | 46 |  |  |  | 6 |  |  |  | — |
Undistributed earnings reallocated to restricted shares |  |  | (8 | ) |  |  | (46 | ) |  |  | (6 | ) |  |  | — |
Earnings (loss) available to Kirby common stockholders – diluted |  | $ | 10,182 |  |  | $ | 24,956 |  |  | $ | 6,809 |  |  | $ | (322,239 | )
Shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common stock issued and outstanding |  |  | 60,101 |  |  |  | 60,023 |  |  |  | 60,088 |  |  |  | 60,003 |
Weighted average unvested restricted stock |  |  | (48 | ) |  |  | (111 | ) |  |  | (53 | ) |  |  | (105 | )
Weighted average common stock outstanding – basic |  |  | 60,053 |  |  |  | 59,912 |  |  |  | 60,035 |  |  |  | 59,898 |
Dilutive effect of stock options and restricted stock units |  |  | 221 |  |  |  | 25 |  |  |  | 185 |  |  |  | — |
Weighted average common stock outstanding – diluted |  |  | 60,274 |  |  |  | 59,937 |  |  |  | 60,220 |  |  |  | 59,898 |
Net earnings (loss) per share attributable to Kirby common stockholders: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.17 |  |  | $ | 0.42 |  |  | $ | 0.11 |  |  | $ | (5.38 | )
Diluted |  | $ | 0.17 |  |  | $ | 0.42 |  |  | $ | 0.11 |  |  | $ | (5.38 | )

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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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