Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues:
Total revenues	$ 134,817	$ 229,170
Operating expenses:
Depreciation	74,626	93,043
General and administrative	12,366	16,345
Impairment of assets	197,027	774,028
Gain on disposition of assets	(5,401)	(3,433)
Total operating expenses	432,028	1,075,607
Operating loss	(297,211)	(846,437)
Other income (expense):
Interest income	30	389
Interest expense, net of amounts capitalized (excludes $28,266 of contractual interest expense on debt subject to compromise for the three-month period ended March 31, 2021)	(32,562)	(32,321)
Foreign currency transaction gain	625	207
Reorganization items, net	(35,252)
Other, net	489	323
Loss before income tax expense	(363,881)	(877,839)
Income tax benefit	2,200	15,899
Net loss	$ (361,681)	$ (861,940)
Loss per share, Basic and Diluted	$ (2.62)	$ (6.25)
Weighted-average shares outstanding, Basic and Diluted	138,054	137,831
Contract Drilling [Member]
Revenues:
Total revenues	$ 122,553	$ 217,866
Operating expenses:
Contract drilling, excluding depreciation	141,573	184,511
Reimbursable Expenses [Member]
Revenues:
Total revenues	12,264	11,304
Operating expenses:
Contract drilling, excluding depreciation	$ 11,837	$ 11,113