Earnings Per Share

12 Months Ended

Dec. 31, 2021

(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,
	2021			2020			2019
Net earnings (loss) attributable to Kirby	$	(246,954	)	$	(272,546	)	$	142,347
Undistributed earnings allocated to restricted shares		—			—			(369	)
Earnings (loss) available to Kirby common stockholders — basic		(246,954	)		(272,546	)		141,978
Undistributed earnings allocated to restricted shares		—			—			369
Undistributed earnings reallocated to restricted shares		—			—			(369	)
Earnings (loss) available to Kirby common stockholders — diluted	$	(246,954	)	$	(272,546	)	$	141,978

Shares outstanding:
Weighted average common stock issued and outstanding		60,099			60,021			59,905
Weighted average unvested restricted stock		(46	)		(109	)		(155	)
Weighted average common stock outstanding — basic		60,053			59,912			59,750
Dilutive effect of stock options and restricted stock units		—			—			159
Weighted average common stock outstanding — diluted		60,053			59,912			59,909

Net earnings (loss) per share attributable to Kirby common stockholders:
Basic	$	(4.11	)	$	(4.55	)	$	2.38
Diluted	$	(4.11	)	$	(4.55	)	$	2.37

Certain outstanding options to purchase approximately 567,000, 681,000, and 187,000 shares of common stock were excluded in the computation of diluted earnings per share as of December 31, 2021, 2020, and 2019, 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, 2019.