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Earnings Per Share | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
Earnings Per Share |
(9) | Earnings Per Share
The following table presents the components of basic and diluted loss per share (in thousands, except per share amounts):
|  | Three Months Ended March 31, |
|  | 2021 |  |  | 2020 |
Loss attributable to Kirby common stockholders – basic and diluted |  | $ | (3,375 | ) |  | $ | (347,241 | )
Shares outstanding: |  |  |  |  |  |  |  |
Weighted average common stock issued and outstanding |  |  | 60,074 |  |  |  | 59,983 |
Weighted average unvested restricted stock |  |  | (58 | ) |  |  | (100 | )
Weighted average common stock outstanding – basic and diluted |  |  | 60,016 |  |  |  | 59,883 |
Net loss per share attributable to Kirby common stockholders: |  |  |  |  |  |  |  |
Basic |  | $ | (0.06 | ) |  | $ | (5.80 | )
Diluted |  | $ | (0.06 | ) |  | $ | (5.80 | )
Certain outstanding options to purchase approximately 572,000 and 681,000 shares of common stock were excluded in the computation of diluted earnings per share as of March 31, 2021 and 2020, respectively, as such stock options would have been antidilutive. Certain outstanding RSUs to convert to 7,000 and 344,000 shares of common stock were also excluded in the computation of diluted earnings per share as of March 31, 2021 and 2020, respectively, as such RSUs would have been antidilutive.

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