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Earnings Per Share | 3 Months Ended
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Mar. 31, 2023
Earnings Per Share [Abstract] |
Earnings Per Share | (9) Earnings Per Share The following table presents the components of basic and diluted earnings per share (in thousands, except per share amounts):
|  | Three Months Ended March 31, |
|  | 2023 |  |  | 2022 |
Net earnings attributable to Kirby |  | $ | 40,698 |  |  | $ | 17,434 |
Undistributed earnings allocated to restricted shares |  |  | (2 | ) |  |  | (3 | )
Earnings available to Kirby common stockholders – basic |  |  | 40,696 |  |  |  | 17,431 |
Undistributed earnings allocated to restricted shares |  |  | 2 |  |  |  | 3 |
Undistributed earnings reallocated to restricted shares |  |  | (2 | ) |  |  | (3 | )
Earnings available to Kirby common stockholders – diluted |  | $ | 40,696 |  |  | $ | 17,431 |
Shares outstanding: |  |  |  |  |  |
Weighted average common stock issued and outstanding |  |  | 59,981 |  |  |  | 60,182 |
Weighted average unvested restricted stock |  |  | (3 | ) |  |  | (9 | )
Weighted average common stock outstanding – basic |  |  | 59,978 |  |  |  | 60,173 |
Dilutive effect of stock options and restricted stock units |  |  | 294 |  |  |  | 290 |
Weighted average common stock outstanding – diluted |  |  | 60,272 |  |  |  | 60,463 |
Net earnings per share attributable to Kirby common stockholders: |  |  |  |  |  |
Basic |  | $ | 0.68 |  |  | $ | 0.29 |
Diluted |  | $ | 0.68 |  |  | $ | 0.29 |
Certain outstanding options to purchase approximately 0.3 million and 0.4 million shares of common stock were excluded in the computation of diluted earnings per share as of March 31, 2023 and 2022, respectively, as such stock options would have been antidilutive. There were no antidilutive RSUs as of March 31, 2023 and 2022.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI https://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3630-109257 + Details
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