Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($) $ in Thousands	1 Months Ended	11 Months Ended	12 Months Ended
	Feb. 02, 2021	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total revenues	$ 45,928	$ 648,754		$ 667,249	$ 972,052
Cost of revenues (exclusive of depreciation, depletion, amortization and accretion)	29,773	422,252		408,131	558,265
Depreciation, depletion, amortization and accretion	8,358	219,859		115,771	146,791
General and administrative expenses	11,052	117,575		205,773	244,403
Restructuring expense	1,270	22,952		47,055
Other expenses	0	16,726	$ 16,700	0	0
Reduction in value of assets	0	0		23,775	9,293
Income (loss) from operations	(4,525)	(150,610)		(133,256)	13,300
Interest income (expense), net	202	2,331		(92,426)	(98,339)
Reorganization expenses	(335,560)	0	(335,600)	19,520	0
Other income (expense)	(2,105)	(7,128)		(9,229)	(2,484)
Income (loss) from continuing operations before income taxes	329,132	(155,407)		(254,431)	(87,523)
Rentals [Member]
Segment Reporting Information [Line Items]
Total revenues	18,339	268,695		297,835	430,442
Cost of revenues (exclusive of depreciation, depletion, amortization and accretion)	7,839	105,373		109,902	168,608
Depreciation, depletion, amortization and accretion	4,271	152,250		63,072	86,395
General and administrative expenses	2,027	24,812		52,718	61,829
Restructuring expense		0
Other expenses		3,609	3,600
Reduction in value of assets				754	0
Income (loss) from operations	4,202	(17,349)		71,389	113,610
Interest income (expense), net	10	(7)			0
Reorganization expenses	2,037			0	0
Other income (expense)	(399)	1,280			0
Income (loss) from continuing operations before income taxes	1,776	(16,076)		71,389	113,610
Well Services [Member]
Segment Reporting Information [Line Items]
Total revenues	27,589	380,059		369,414	541,610
Cost of revenues (exclusive of depreciation, depletion, amortization and accretion)	21,934	316,879		298,229	389,657
Depreciation, depletion, amortization and accretion	3,666	61,074		48,929	55,670
General and administrative expenses	4,111	46,780		73,200	89,272
Restructuring expense		0
Other expenses		13,117	$ 13,100
Reduction in value of assets				21,038	9,293
Income (loss) from operations	(2,122)	(57,791)		(71,982)	(2,282)
Interest income (expense), net	356	3,930		4,539	4,172
Reorganization expenses	(31,816)			0	0
Other income (expense)	(165)	(14,407)			0
Income (loss) from continuing operations before income taxes	29,885	(68,268)		(67,443)	1,890
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Total revenues				0	0
Cost of revenues (exclusive of depreciation, depletion, amortization and accretion)				0	0
Depreciation, depletion, amortization and accretion	421	6,535		3,770	4,726
General and administrative expenses	4,914	45,983		79,855	93,302
Restructuring expense	1,270	22,952		47,055
Other expenses		0
Reduction in value of assets				1,983	0
Income (loss) from operations	(6,605)	(75,470)		(132,663)	(98,028)
Interest income (expense), net	164	1,592		(96,965)	(102,511)
Reorganization expenses	(305,781)			19,520	0
Other income (expense)	(1,541)	5,999		9,229	(2,484)
Income (loss) from continuing operations before income taxes	$ 297,471	$ (71,063)		$ (258,377)	$ (203,023)