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Earnings Per Share | 12 Months Ended
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Dec. 31, 2023
Earnings Per Share [Abstract] |
Earnings Per Share | (10) Earnings Per Share The following table presents the components of basic and diluted earnings (loss) per share (in thousands, except per share amounts):
|  | Year Ended December 31, |
|  | 2023 |  |  | 2022 |  |  | 2021 |
Net earnings (loss) attributable to Kirby |  | $ | 222,935 |  |  | $ | 122,291 |  |  | $ | (246,954 | )
Undistributed earnings allocated to restricted shares |  |  | (62 | ) |  |  | (33 | ) |  |  | — |
Earnings (loss) available to Kirby common stockholders — basic |  |  | 222,873 |  |  |  | 122,258 |  |  |  | (246,954 | )
Undistributed earnings allocated to restricted shares |  |  | 62 |  |  |  | 33 |  |  |  | — |
Undistributed earnings reallocated to restricted shares |  |  | (62 | ) |  |  | (33 | ) |  |  | — |
Earnings (loss) available to Kirby common stockholders — diluted |  | $ | 222,873 |  |  | $ | 122,258 |  |  | $ | (246,954 | )
Shares outstanding: |  |  |  |  |  |  |  |  |
Weighted average common stock issued and outstanding |  |  | 59,548 |  |  |  | 60,055 |  |  |  | 60,099 |
Weighted average unvested restricted stock |  |  | (17 | ) |  |  | (17 | ) |  |  | (46 | )
Weighted average common stock outstanding — basic |  |  | 59,531 |  |  |  | 60,038 |  |  |  | 60,053 |
Dilutive effect of stock options and restricted stock units |  |  | 326 |  |  |  | 291 |  |  |  | — |
Weighted average common stock outstanding — diluted |  |  | 59,857 |  |  |  | 60,329 |  |  |  | 60,053 |
Net earnings (loss) per share attributable to Kirby common stockholders: |  |  |  |  |  |  |  |  |
Basic |  | $ | 3.74 |  |  | $ | 2.04 |  |  | $ | (4.11 | )
Diluted |  | $ | 3.72 |  |  | $ | 2.03 |  |  | $ | (4.11 | )
Diluted earnings per share was computed using the treasury stock method. Certain outstanding options to purchase approximately 33,000, 381,000, and 567,000 shares of common stock were excluded in the computation of diluted earnings per share as of December 31, 2023, 2022, and 2021, respectively, as such stock options would have been antidilutive. Certain outstanding RSUs to convert to 7,000 shares of common stock were also excluded in the computation of diluted earnings per share as of December 31, 2021 as such RSUs would have been antidilutive. No RSUs were antidilutive at December 31, 2023 and 2022.

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