Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($)	1 Months Ended	3 Months Ended		5 Months Ended	6 Months Ended
	Feb. 02, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ 45,928,000	$ 165,892,000	$ 151,582,000	$ 271,735,000	$ 385,821,000	$ 385,821,000
Cost of revenues (exclusive of depreciation, depletion, amortization and accretion	29,773,000	103,579,000	93,426,000	171,447,000		230,939,000
Depreciation, depletion, amortization and accretion	8,358,000	59,018,000	28,708,000	99,048,000		60,889,000
General and administrative expenses	11,052,000	32,308,000	55,528,000	50,746,000		114,804,000
Restructuring and other expenses	1,270,000	7,438,000		15,821,000
Reduction in value of assets						16,522,000
Loss from operations	(4,525,000)	(36,451,000)	(26,080,000)	(65,327,000)		(37,333,000)
Interest income (expense), net	202,000	535,000	(24,757,000)	747,000		(49,898,000)
Reorganization items, net	335,560,000			0
Other income (expense)	(2,105,000)	2,570,000	821,000	(275,000)		(3,411,000)
Income (loss) from continuing operations before income taxes	329,132,000	(33,346,000)	(50,016,000)	(64,855,000)		(90,642,000)
Rentals [Member]
Segment Reporting Information [Line Items]
Revenues	18,339,000	67,237,000		109,685,000
Cost of revenues (exclusive of depreciation, depletion, amortization and accretion	7,839,000	28,034,000		43,355,000
Depreciation, depletion, amortization and accretion	4,271,000	42,083,000		70,141,000
General and administrative expenses	2,027,000	6,352,000		9,803,000
Loss from operations	4,202,000	(9,232,000)		(13,614,000)
Interest income (expense), net	10,000
Reorganization items, net	(2,037,000)
Other income (expense)	(399,000)	(501,000)		(701,000)
Income (loss) from continuing operations before income taxes	1,776,000	(9,733,000)		(14,315,000)
Well Services [Member]
Segment Reporting Information [Line Items]
Revenues	27,589,000	98,655,000		162,050,000
Cost of revenues (exclusive of depreciation, depletion, amortization and accretion	21,934,000	75,545,000		128,092,000
Depreciation, depletion, amortization and accretion	3,666,000	14,859,000		25,676,000
General and administrative expenses	3,107,000	9,566,000		15,826,000
Loss from operations	(1,118,000)	(1,315,000)		(7,544,000)
Interest income (expense), net	1,000	1,000		3,000
Reorganization items, net	31,816,000
Other income (expense)	(165,000)	2,640,000		2,235,000
Income (loss) from continuing operations before income taxes	30,534,000	1,326,000		(5,306,000)
Drilling Products and Services [Member]
Segment Reporting Information [Line Items]
Revenues			67,349,000			171,343,000
Cost of revenues (exclusive of depreciation, depletion, amortization and accretion			22,485,000			57,449,000
Depreciation, depletion, amortization and accretion			15,827,000			33,618,000
General and administrative expenses			10,927,000			25,440,000
Loss from operations			18,110,000			54,836,000
Income (loss) from continuing operations before income taxes			18,110,000			54,836,000
Onshore Completion and Workover Services [Member]
Segment Reporting Information [Line Items]
Cost of revenues (exclusive of depreciation, depletion, amortization and accretion			(29,000)			(2,018,000)
Depreciation, depletion, amortization and accretion			102,000			215,000
General and administrative expenses			12,000			35,000
Loss from operations			(85,000)			1,768,000
Income (loss) from continuing operations before income taxes			(85,000)			1,768,000
Production Services [Member]
Segment Reporting Information [Line Items]
Revenues			43,402,000			118,866,000
Cost of revenues (exclusive of depreciation, depletion, amortization and accretion			37,792,000			100,808,000
Depreciation, depletion, amortization and accretion			7,592,000			15,457,000
General and administrative expenses			6,343,000			13,607,000
Reduction in value of assets						4,064,000
Loss from operations			(8,325,000)			(15,070,000)
Income (loss) from continuing operations before income taxes			(8,325,000)			(15,070,000)
Technical Solutions [Member]
Segment Reporting Information [Line Items]
Revenues			40,831,000			95,612,000
Cost of revenues (exclusive of depreciation, depletion, amortization and accretion			33,178,000			74,700,000
Depreciation, depletion, amortization and accretion			4,260,000			9,604,000
General and administrative expenses			10,209,000			24,244,000
Reduction in value of assets						12,458,000
Loss from operations			(6,816,000)			(25,394,000)
Interest income (expense), net			1,104,000			2,277,000
Income (loss) from continuing operations before income taxes			(5,712,000)			(23,117,000)
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Depreciation, depletion, amortization and accretion	421,000	2,076,000	927,000	3,231,000		1,995,000
General and administrative expenses	5,918,000	16,390,000	28,037,000	25,117,000		51,478,000
Restructuring and other expenses	1,270,000	7,438,000		15,821,000
Loss from operations	(7,609,000)	(25,904,000)	(28,964,000)	(44,169,000)		(53,473,000)
Interest income (expense), net	191,000	534,000	(25,861,000)	744,000		(52,175,000)
Reorganization items, net	305,781,000
Other income (expense)	(1,541,000)	431,000	821,000	(1,809,000)		(3,411,000)
Income (loss) from continuing operations before income taxes	$ 296,822,000	$ (24,939,000)	$ (54,004,000)	$ (45,234,000)		$ (109,059,000)