Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		4 Months Ended	5 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Apr. 23, 2021	Sep. 30, 2021	Sep. 30, 2020
Revenues:
Total revenues	$ 213,877	$ 138,257	$ 169,379	$ 328,788	$ 565,630
Operating expenses:
Depreciation	25,150	75,330	92,758	43,885	243,208
General and administrative	20,976	12,781	15,036	37,193	44,827
Impairment of assets			197,027		774,028
Restructuring and separation costs		344			17,463
Gain on disposition of assets	(767)	(479)	(5,486)	(943)	(4,132)
Total operating expenses	210,613	227,475	496,438	352,672	1,584,767
Operating income (loss)	3,264	(89,218)	(327,059)	(23,884)	(1,019,137)
Other income (expense):
Interest income	2	22	30	3	520
Interest expense, net of amounts capitalized (excludes $37,834 of contractual interest expense on debt subject to compromise for the three-month period ended September 30, 2020)	(9,777)	(98)	(34,827)	(16,874)	(42,753)
Foreign currency transaction gain (loss)	1,173	(661)	(172)	259	(1,458)
Reorganization items, net	(1,916)	(8,663)	(1,639,763)	(7,454)	(62,640)
Other, net	(14)	107	398	10,692	349
Loss before income tax benefit (expense)	(7,268)	(98,511)	(2,001,393)	(37,258)	(1,125,119)
Income tax benefit (expense)	2,086	(95)	39,404	(15,217)	19,753
Net loss	$ (5,182)	$ (98,606)	$ (1,961,989)	$ (52,475)	$ (1,105,366)
Loss per share, Basic and Diluted	$ (0.05)	$ (0.71)	$ (14.21)	$ (0.52)	$ (8.01)
Weighted-average shares outstanding, Basic and Diluted	100,075	138,054	138,054	100,068	137,976
Contract Drilling [Member]
Revenues:
Total revenues	$ 183,156	$ 129,345	$ 153,364	$ 281,189	$ 535,848
Operating expenses:
Contract drilling, excluding depreciation	135,181	130,921	181,626	225,892	481,376
Reimbursable Expenses [Member]
Revenues:
Total revenues	30,721	8,912	16,015	47,599	29,782
Operating expenses:
Contract drilling, excluding depreciation	$ 30,073	$ 8,578	$ 15,477	$ 46,645	$ 27,997