CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues:
Total revenues	$ 102,344	$ 125,859	$ 218,712	$ 248,008
Costs and expenses:
Vessel operating costs	64,774	80,439	143,599	162,642
Costs of other operating revenues	171	586	2,844	1,350
General and administrative	17,597	23,696	39,017	50,836
Depreciation and amortization	28,144	25,038	55,251	47,970
Long-lived asset impairments	55,482	494	65,689	(776)
Affiliate credit loss impairment expense	53,581		53,581
Affiliate guarantee obligation	2,000		2,000
(Gain) loss on asset dispositions, net	(1,660)	494	(6,991)	(776)
Total costs and expenses	220,089	130,253	354,990	262,022
Operating loss	(117,745)	(4,394)	(136,278)	(14,014)
Other income (expense):
Foreign exchange gain (loss)	(2,076)	11	(1,212)	(497)
Equity in net earnings of unconsolidated companies		95		33
Dividend income from unconsolidated company	17,150		17,150
Interest income and other, net	696	1,859	812	4,329
Interest and other debt costs, net	(5,959)	(7,582)	(12,101)	(15,318)
Total other income (expenses)	9,811	(5,617)	4,649	(11,453)
Loss before income taxes	(107,934)	(10,011)	(131,629)	(25,467)
Income tax (benefit) expense	2,730	5,542	(2,441)	11,372
Net loss	(110,664)	(15,553)	(129,188)	(36,839)
Net income (loss) attributable to noncontrolling interests	(41)	406	(120)	851
Net loss attributable to Tidewater Inc.	$ (110,623)	$ (15,959)	$ (129,068)	$ (37,690)
Basic loss per common share	$ (2.74)	$ (0.42)	$ (3.21)	$ (1.01)
Diluted loss per common share	$ (2.74)	$ (0.42)	$ (3.21)	$ (1.01)
Weighted average common shares outstanding	40,306	37,571	40,203	37,369
Adjusted weighted average common shares	40,306	37,571	40,203	37,369
Vessel Revenues
Revenues:
Total revenues	$ 100,975	$ 123,641	$ 212,949	$ 243,303
Other Operating Revenues
Revenues:
Total revenues	$ 1,369	$ 2,218	$ 5,763	$ 4,705