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Earnings Per Share | 6 Months Ended
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Jun. 30, 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 June 30, |  |  | Six Months Ended June 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Net earnings attributable to Kirby |  | $ | 57,367 |  |  | $ | 28,457 |  |  | $ | 98,065 |  |  | $ | 45,891 |
Undistributed earnings allocated to restricted shares |  |  | (22 | ) |  |  | (10 | ) |  |  | (21 | ) |  |  | (11 | )
Earnings available to Kirby common stockholders – basic |  |  | 57,345 |  |  |  | 28,447 |  |  |  | 98,044 |  |  |  | 45,880 |
Undistributed earnings allocated to restricted shares |  |  | 22 |  |  |  | 10 |  |  |  | 21 |  |  |  | 11 |
Undistributed earnings reallocated to restricted shares |  |  | (22 | ) |  |  | (10 | ) |  |  | (21 | ) |  |  | (11 | )
Earnings available to Kirby common stockholders – diluted |  | $ | 57,345 |  |  | $ | 28,447 |  |  | $ | 98,044 |  |  | $ | 45,880 |
Shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common stock issued and outstanding |  |  | 59,829 |  |  |  | 60,222 |  |  |  | 59,905 |  |  |  | 60,202 |
Weighted average unvested restricted stock |  |  | (23 | ) |  |  | (20 | ) |  |  | (13 | ) |  |  | (14 | )
Weighted average common stock outstanding – basic |  |  | 59,806 |  |  |  | 60,202 |  |  |  | 59,892 |  |  |  | 60,188 |
Dilutive effect of stock options and restricted stock units |  |  | 279 |  |  |  | 265 |  |  |  | 287 |  |  |  | 277 |
Weighted average common stock outstanding – diluted |  |  | 60,085 |  |  |  | 60,467 |  |  |  | 60,179 |  |  |  | 60,465 |
Net earnings per share attributable to Kirby common stockholders: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.96 |  |  | $ | 0.47 |  |  | $ | 1.64 |  |  | $ | 0.76 |
Diluted |  | $ | 0.95 |  |  | $ | 0.47 |  |  | $ | 1.63 |  |  | $ | 0.76 |
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 June 30, 2023 and 2022, respectively, as such stock options would have been antidilutive. Certain outstanding RSUs to convert to 12,000 shares of common stock were also excluded in the computation of diluted earnings per share as of June 30, 2022 as such RSUs would have been antidilutive. There were no antidilutive RSUs as of June 30, 2023.

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