Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2022

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

The following table presents the components of basic and diluted earnings (loss) per share (in thousands, except per share amounts):

	Three Months Ended March 31,
	2022			2021
Net earnings (loss) attributable to Kirby	$	17,434		$	(3,375	)
Undistributed earnings allocated to restricted shares		(3	)		—
Earnings (loss) available to Kirby common stockholders – basic		17,431			(3,375	)
Undistributed earnings allocated to restricted shares		3			—
Undistributed earnings reallocated to restricted shares		(3	)		—
Earnings (loss) available to Kirby common stockholders – diluted	$	17,431		$	(3,375	)
Shares outstanding:
Weighted average common stock issued and outstanding		60,182			60,074
Weighted average unvested restricted stock		(9	)		(58	)
Weighted average common stock outstanding – basic		60,173			60,016
Dilutive effect of stock options and restricted stock units		290			—
Weighted average common stock outstanding – diluted		60,463			60,016
Net earnings (loss) per share attributable to Kirby common stockholders:
Basic	$	0.29		$	(0.06	)
Diluted	$	0.29		$	(0.06	)