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	$ 198,203	$ 216,706	$ 427,373	$ 450,248
Operating expenses:
Depreciation	74,835	88,253	167,878	175,151
General and administrative	15,701	15,294	32,046	32,605
Impairment of assets			774,028
Restructuring and separation costs	17,119		17,119
Gain on disposition of assets	(220)	(9,436)	(3,653)	(5,149)
Total operating expenses	281,685	328,206	1,357,292	610,874
Operating loss	(83,482)	(111,500)	(929,919)	(160,626)
Other income (expense):
Interest income	108	1,933	498	4,346
Interest expense, net of amounts capitalized (excludes $24.6 million of contractual interest expense on debt subject to compromise for the three- and six-month periods ended June 30, 2020)	(10,333)	(31,159)	(42,655)	(61,084)
Foreign currency transaction loss	(1,004)	(721)	(797)	(1,806)
Reorganization items, net	(53,977)		(53,977)
Other, net	(81)	105	242	438
Loss before income tax benefit	(148,769)	(141,342)	(1,026,608)	(218,732)
Income tax benefit	3,949	27,354	19,848	31,416
Net loss	$ (144,820)	$ (113,988)	$ (1,006,760)	$ (187,316)
Loss per share, Basic and Diluted	$ (1.05)	$ (0.83)	$ (7.30)	$ (1.36)
Weighted-average shares outstanding:
Shares of common stock	138,043	137,691	137,937	137,607
Total weighted-average shares outstanding	138,043	137,691	137,937	137,607
Contract Drilling [Member]
Revenues:
Total revenues	$ 188,637	$ 207,273	$ 406,503	$ 433,970
Operating expenses:
Contract drilling, excluding depreciation	165,943	224,782	350,455	392,210
Reimbursable Expenses [Member]
Revenues:
Total revenues	9,566	9,433	20,870	16,278
Operating expenses:
Contract drilling, excluding depreciation	$ 8,307	$ 9,313	$ 19,419	$ 16,057