CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 32,577	$ 80,577
Accounts receivable:
Trade - less allowance for doubtful accounts of $7,636 ($7,684 in 2022)	526,691	483,406
Other	52,025	114,556
Inventories - net	454,389	461,848
Prepaid expenses and other current assets	69,479	71,372
Total current assets	1,135,161	1,211,759
Property and equipment - net	3,861,105	3,633,462
Operating lease right-of-use assets	152,216	154,507
Investment in affiliates	2,576	2,171
Goodwill	438,748	438,748
Other intangibles, net	42,927	51,463
Other assets	89,464	62,814
Total assets	5,722,197	5,554,924
Current liabilities:
Bank notes payable	8,068	3,292
Income taxes payable	1,486	323
Accounts payable	269,378	278,081
Accrued liabilities:
Interest	13,114	11,630
Insurance premiums and claims	84,825	65,088
Employee compensation	69,075	55,851
Taxes - other than on income	31,555	30,169
Other	30,377	42,014
Current portion of operating lease liabilities	33,340	36,444
Deferred revenues	134,577	119,305
Total current liabilities	675,795	642,197
Long-term debt, net - less current portion	1,008,527	1,076,326
Deferred income taxes	696,557	625,884
Operating lease liabilities - less current portion	138,811	142,140
Other long-term liabilities	15,830	23,209
Total long-term liabilities	1,859,725	1,867,559
Contingencies and commitments	0	0
Kirby stockholders' equity:
Common stock, $0.10 par value per share. Authorized 120,000,000 shares, issued 65,472,000	6,547	6,547
Additional paid-in capital	863,963	859,345
Accumulated other comprehensive income - net	35,006	16,853
Retained earnings	2,691,665	2,468,730
Treasury stock - at cost, 6,843,000 shares in 2023 and 5,565,000 shares in 2022	(411,750)	(308,598)
Total Kirby stockholders' equity	3,185,431	3,042,877
Noncontrolling interests	1,246	2,291
Total equity	3,186,677	3,045,168
Total liabilities and equity	$ 5,722,197	$ 5,554,924