Earnings Per Share

12 Months Ended

Dec. 31, 2022

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,
	2022			2021			2020
Net earnings (loss) attributable to Kirby	$	122,291		$	(246,954	)	$	(272,546	)
Undistributed earnings allocated to restricted shares		(33	)		—			—
Earnings (loss) available to Kirby common stockholders — basic		122,258			(246,954	)		(272,546	)
Undistributed earnings allocated to restricted shares		33			—			—
Undistributed earnings reallocated to restricted shares		(33	)		—			—
Earnings (loss) available to Kirby common stockholders — diluted	$	122,258		$	(246,954	)	$	(272,546	)
Shares outstanding:
Weighted average common stock issued and outstanding		60,055			60,099			60,021
Weighted average unvested restricted stock		(17	)		(46	)		(109	)
Weighted average common stock outstanding — basic		60,038			60,053			59,912
Dilutive effect of stock options and restricted stock units		291			—			—
Weighted average common stock outstanding — diluted		60,329			60,053			59,912
Net earnings (loss) per share attributable to Kirby common stockholders:
Basic	$	2.04		$	(4.11	)	$	(4.55	)
Diluted	$	2.03		$	(4.11	)	$	(4.55	)

Certain outstanding options to purchase approximately 0.4 million, 0.6 million, and 0.7 million shares of common stock were excluded in the computation of diluted earnings per share as of December 31, 2022, 2021, and 2020, respectively, as such stock options would have been antidilutive. Certain outstanding RSUs to convert to 7,000 and 11,000 shares of common stock were also excluded in the computation of diluted earnings per share as of December 31, 2021 and 2020, respectively, as such RSUs would have been antidilutive. No RSUs were antidilutive at December 31, 2022.