Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2024

Earnings Per Share [Abstract]

Schedule of Loss Per Share

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

	Year Ended December 31,
	2024			2023			2022
Net earnings attributable to Kirby	$	286,707		$	222,935		$	122,291
Undistributed earnings allocated to restricted shares		(37	)		(62	)		(33	)
Earnings available to Kirby common stockholders — basic		286,670			222,873			122,258
Undistributed earnings allocated to restricted shares		37			62			33
Undistributed earnings reallocated to restricted shares		(36	)		(62	)		(33	)
Earnings available to Kirby common stockholders — diluted	$	286,671		$	222,873		$	122,258
Shares outstanding:
Weighted average common stock issued and outstanding		57,954			59,548			60,055
Weighted average unvested restricted stock		(7	)		(17	)		(17	)
Weighted average common stock outstanding — basic		57,947			59,531			60,038
Dilutive effect of stock options and restricted stock units		408			326			291
Weighted average common stock outstanding — diluted		58,355			59,857			60,329
Net earnings per share attributable to Kirby common stockholders:
Basic	$	4.95		$	3.74		$	2.04
Diluted	$	4.91		$	3.72		$	2.03