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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, |
|  | 2020 |  |  | 2019 |
Net earnings (loss) attributable to Kirby |  | $ | (248,468 | ) |  | $ | 44,296 |
Undistributed earnings allocated to restricted shares |  |  | — |  |  |  | (119 | )
Income (loss) available to Kirby common stockholders – basic |  |  | (248,468 | ) |  |  | 44,177 |
Undistributed earnings allocated to restricted shares |  |  | — |  |  |  | 119 |
Undistributed earnings reallocated to restricted shares |  |  | — |  |  |  | (119 | )
Income (loss) available to Kirby common stockholders – diluted |  | $ | (248,468 | ) |  | $ | 44,177 |
Shares outstanding: |  |  |  |  |  |  |  |
Weighted average common stock issued and outstanding |  |  | 59,983 |  |  |  | 59,869 |
Weighted average unvested restricted stock |  |  | (100 | ) |  |  | (160 | )
Weighted average common stock outstanding – basic |  |  | 59,883 |  |  |  | 59,709 |
Dilutive effect of stock options and restricted stock units |  |  | — |  |  |  | 114 |
Weighted average common stock outstanding – diluted |  |  | 59,883 |  |  |  | 59,823 |
Net earnings (loss) per share attributable to Kirby common stockholders: |  |  |  |  |  |  |  |
Basic |  | $ | (4.15 | ) |  | $ | 0.74 |
Diluted |  | $ | (4.15 | ) |  | $ | 0.74 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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