Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues:
Total revenues	$ 138,257	$ 254,020	$ 565,630	$ 704,268
Operating expenses:
Depreciation	75,330	88,693	243,208	263,844
General and administrative	12,781	18,830	44,827	51,436
Impairment of assets			774,028
Restructuring and separation costs	344		17,463
(Gain) loss on disposition of assets	(479)	6,340	(4,132)	1,191
Total operating expenses	227,475	326,854	1,584,767	937,729
Operating loss	(89,218)	(72,834)	(1,019,137)	(233,461)
Other income (expense):
Interest income	22	1,317	520	5,664
Interest expense, net of amounts capitalized (excludes $37,834 and $62,470 of contractual interest expense on debt subject to compromise for the three- and nine-month periods ended September 30, 2020)	(98)	(31,098)	(42,753)	(92,182)
Foreign currency transaction loss	(661)	(77)	(1,458)	(1,883)
Reorganization items, net	(8,663)		(62,640)
Other, net	107	82	349	520
Loss before income tax (expense) benefit	(98,511)	(102,610)	(1,125,119)	(321,342)
Income tax (expense) benefit	(95)	7,482	19,753	38,898
Net loss	$ (98,606)	$ (95,128)	$ (1,105,366)	$ (282,444)
Loss per share, Basic and Diluted	$ (0.71)	$ (0.69)	$ (8.01)	$ (2.05)
Weighted-average shares outstanding:
Shares of common stock	138,054	137,694	137,976	137,636
Total weighted-average shares outstanding	138,054	137,694	137,976	137,636
Contract Drilling [Member]
Revenues:
Total revenues	$ 129,345	$ 242,315	$ 535,848	$ 676,284
Operating expenses:
Contract drilling, excluding depreciation	130,921	201,568	481,376	593,779
Reimbursable Expenses [Member]
Revenues:
Total revenues	8,912	11,705	29,782	27,984
Operating expenses:
Contract drilling, excluding depreciation	$ 8,578	$ 11,423	$ 27,997	$ 27,479