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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2020
Earnings Per Share [Abstract] |
Basic and Diluted Earnings 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, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Net earnings (loss) attributable to Kirby |  | $ | 25,002 |  |  | $ | 47,287 |  |  | $ | (322,239 | ) |  | $ | 91,583 |
Undistributed earnings allocated to restricted shares |  |  | (46 | ) |  |  | (122 | ) |  |  | — |  |  |  | (241 | )
Income (loss) available to Kirby common stockholders – basic |  |  | 24,956 |  |  |  | 47,165 |  |  |  | (322,239 | ) |  |  | 91,342 |
Undistributed earnings allocated to restricted shares |  |  | 46 |  |  |  | 122 |  |  |  | — |  |  |  | 241 |
Undistributed earnings reallocated to restricted shares |  |  | (46 | ) |  |  | (122 | ) |  |  | — |  |  |  | (240 | )
Income (loss) available to Kirby common stockholders – diluted |  | $ | 24,956 |  |  | $ | 47,165 |  |  | $ | (322,239 | ) |  | $ | 91,343 |
Shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common stock issued and outstanding |  |  | 60,023 |  |  |  | 59,894 |  |  |  | 60,003 |  |  |  | 59,882 |
Weighted average unvested restricted stock |  |  | (111 | ) |  |  | (154 | ) |  |  | (105 | ) |  |  | (157 | )
Weighted average common stock outstanding – basic |  |  | 59,912 |  |  |  | 59,740 |  |  |  | 59,898 |  |  |  | 59,725 |
Dilutive effect of stock options and restricted stock units |  |  | 25 |  |  |  | 167 |  |  |  | — |  |  |  | 140 |
Weighted average common stock outstanding – diluted |  |  | 59,937 |  |  |  | 59,907 |  |  |  | 59,898 |  |  |  | 59,865 |
Net earnings (loss) per share attributable to Kirby common stockholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.42 |  |  | $ | 0.79 |  |  | $ | (5.38 | ) |  | $ | 1.53 |
Diluted |  | $ | 0.42 |  |  | $ | 0.79 |  |  | $ | (5.38 | ) |  | $ | 1.53 |

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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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