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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Earnings Per Share | The following table presents the components of basic and diluted earnings per share (in thousands, except per share amounts):
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Net earnings (loss) attributable to Kirby |  | $ | (272,546 | ) |  | $ | 142,347 |  |  | $ | 78,452 |
Undistributed earnings allocated to restricted shares |  |  | — |  |  |  | (369 | ) |  |  | (324 | )
Income (loss) available to Kirby common stockholders — basic |  |  | (272,546 | ) |  |  | 141,978 |  |  |  | 78,128 |
Undistributed earnings allocated to restricted shares |  |  | — |  |  |  | 369 |  |  |  | 324 |
Undistributed earnings reallocated to restricted shares |  |  | — |  |  |  | (369 | ) |  |  | (323 | )
Income (loss) available to Kirby common stockholders — diluted |  | $ | (272,546 | ) |  | $ | 141,978 |  |  | $ | 78,129 |
Shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common stock issued and outstanding |  |  | 60,021 |  |  |  | 59,905 |  |  |  | 59,804 |
Weighted average unvested restricted stock |  |  | (109 | ) |  |  | (155 | ) |  |  | (247 | )
Weighted average common stock outstanding — basic |  |  | 59,912 |  |  |  | 59,750 |  |  |  | 59,557 |
Dilutive effect of stock options and restricted stock units |  |  | — |  |  |  | 159 |  |  |  | 132 |
Weighted average common stock outstanding — diluted |  |  | 59,912 |  |  |  | 59,909 |  |  |  | 59,689 |
Net earnings (loss) per share attributable to Kirby common stockholders: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | (4.55 | ) |  | $ | 2.38 |  |  | $ | 1.31 |
Diluted |  | $ | (4.55 | ) |  | $ | 2.37 |  |  | $ | 1.31 |

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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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