Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($)	1 Months Ended	2 Months Ended	3 Months Ended
	Feb. 02, 2021	Mar. 31, 2021	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 56,647,000	$ 129,095,000	$ 321,497,000	$ 321,497,000
Cost of revenues (exclusive of depreciation, depletion, amortization and accretion	39,962,000	89,698,000		211,686,000
Depreciation, depletion, amortization and accretion	10,498,000	52,807,000		41,355,000
General and administrative expenses	12,164,000	20,937,000		65,157,000
Restructuring and other expenses	1,270,000	8,383,000
Reduction in value of assets				16,522,000
Loss from operations	(7,247,000)	(42,730,000)		(13,223,000)
Interest income (expense), net	204,000	215,000		(25,134,000)
Reorganization items, net	335,560,000	0
Other income (expense):	(2,104,000)	(2,845,000)		(4,232,000)
Income (loss) from continuing operations before income taxes	326,413,000	(45,360,000)		(42,589,000)
Global [Member]
Segment Reporting Information [Line Items]
Revenues	40,878,000	90,823,000
Cost of revenues (exclusive of depreciation, depletion, amortization and accretion	24,898,000	57,607,000
Depreciation, depletion, amortization and accretion	7,135,000	36,079,000
General and administrative expenses	5,521,000	10,611,000
Loss from operations	3,324,000	(13,474,000)
Interest income (expense), net	355,000	710,000
Reorganization items, net	39,416,000
Income (loss) from continuing operations before income taxes	43,095,000	(12,764,000)
North America, Segment [Member]
Segment Reporting Information [Line Items]
Revenues	15,769,000	38,272,000
Cost of revenues (exclusive of depreciation, depletion, amortization and accretion	15,064,000	32,091,000
Depreciation, depletion, amortization and accretion	3,049,000	15,456,000
General and administrative expenses	1,786,000	3,636,000
Loss from operations	(4,130,000)	(12,911,000)
Reorganization items, net	(76,238,000)
Income (loss) from continuing operations before income taxes	(80,368,000)	(12,911,000)
Drilling Products and Services [Member]
Segment Reporting Information [Line Items]
Revenues				103,993,000
Cost of revenues (exclusive of depreciation, depletion, amortization and accretion				34,963,000
Depreciation, depletion, amortization and accretion				17,790,000
General and administrative expenses				14,513,000
Loss from operations				36,727,000
Income (loss) from continuing operations before income taxes				36,727,000
Onshore Completion and Workover Services [Member]
Segment Reporting Information [Line Items]
Revenues				61,218,000
Cost of revenues (exclusive of depreciation, depletion, amortization and accretion				52,589,000
Depreciation, depletion, amortization and accretion				6,313,000
General and administrative expenses				5,314,000
Loss from operations				(2,998,000)
Income (loss) from continuing operations before income taxes				(2,998,000)
Production Services [Member]
Segment Reporting Information [Line Items]
Revenues				101,504,000
Cost of revenues (exclusive of depreciation, depletion, amortization and accretion				82,612,000
Depreciation, depletion, amortization and accretion				10,838,000
General and administrative expenses				7,855,000
Reduction in value of assets				4,096,000
Loss from operations				(3,897,000)
Income (loss) from continuing operations before income taxes				(3,897,000)
Technical Solutions [Member]
Segment Reporting Information [Line Items]
Revenues				54,782,000
Cost of revenues (exclusive of depreciation, depletion, amortization and accretion				41,522,000
Depreciation, depletion, amortization and accretion				5,345,000
General and administrative expenses				13,991,000
Reduction in value of assets				12,426,000
Loss from operations				(18,502,000)
Interest income (expense), net				1,173,000
Income (loss) from continuing operations before income taxes				(17,329,000)
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and accretion	314,000	1,272,000		1,069,000
General and administrative expenses	4,857,000	6,690,000		23,484,000
Restructuring and other expenses	1,270,000	8,383,000
Loss from operations	(6,441,000)	(16,345,000)		(24,553,000)
Interest income (expense), net	(151,000)	(495,000)		(26,307,000)
Reorganization items, net	372,382,000
Other income (expense):	(2,104,000)	(2,845,000)		(4,232,000)
Income (loss) from continuing operations before income taxes	$ 363,686,000	$ (19,685,000)		$ (55,092,000)