CONDENSED STATEMENTS OF EARNINGS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues:
Total revenues	$ 697,964	$ 559,624	$ 1,308,746	$ 1,056,474
Costs and expenses:
Costs of sales and operating expenses	523,862	409,479	974,480	772,519
Selling, general and administrative	70,575	62,740	146,340	132,369
Taxes, other than on income	9,621	10,364	19,211	18,624
Depreciation and amortization	50,115	55,132	100,079	110,022
Gain on disposition of assets	(2,745)	(2,119)	(7,594)	(4,252)
Total costs and expenses	651,428	535,596	1,232,516	1,029,282
Operating income	46,536	24,028	76,230	27,192
Other income	3,740	2,523	8,048	6,314
Interest expense	(10,640)	(10,706)	(20,843)	(21,672)
Earnings before taxes on income	39,636	15,845	63,435	11,834
Provision for taxes on income	(11,030)	(5,493)	(17,243)	(4,602)
Net earnings	28,606	10,352	46,192	7,232
Net earnings attributable to noncontrolling interests	(149)	(162)	(301)	(417)
Net earnings attributable to Kirby	$ 28,457	$ 10,190	$ 45,891	$ 6,815
Net earnings per share attributable to Kirby common stockholders:
Basic	$ 0.47	$ 0.17	$ 0.76	$ 0.11
Diluted	$ 0.47	$ 0.17	$ 0.76	$ 0.11
Marine Transportation [Member]
Revenues:
Total revenues	$ 405,655	$ 332,887	$ 761,191	$ 633,838
Distribution and Services [Member]
Revenues:
Total revenues	$ 292,309	$ 226,737	$ 547,555	$ 422,636