CONDENSED STATEMENTS OF EARNINGS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues:
Total revenues	$ 643,926	$ 744,621
Costs and expenses:
Costs of sales and operating expenses	453,568	536,655
Selling, general and administrative	72,080	72,796
Taxes, other than on income	11,406	9,998
Depreciation and amortization	55,786	55,223
Impairments and other charges	561,274	0
Gain on disposition of assets	(492)	(2,157)
Total costs and expenses	1,153,622	672,515
Operating income (loss)	(509,696)	72,106
Other income (expense)	2,723	(568)
Interest expense	(12,799)	(13,201)
Earnings (loss) before taxes on income	(519,772)	58,337
(Provision) benefit for taxes on income	172,809	(13,880)
Net earnings (loss)	(346,963)	44,457
Less: Net earnings attributable to noncontrolling interests	(278)	(161)
Net earnings (loss) attributable to Kirby	$ (347,241)	$ 44,296
Net earnings (loss) per share attributable to Kirby common stockholders:
Basic (in dollars per share)	$ (5.80)	$ 0.74
Diluted (in dollars per share)	$ (5.80)	$ 0.74
Marine Transportation [Member]
Revenues:
Total revenues	$ 403,257	$ 368,121
Distribution and Services [Member]
Revenues:
Total revenues	$ 240,669	$ 376,500