Discontinued Operations (Components Of Income (Loss) From Discontinued Operations) (Details) - USD ($) $ in Thousands	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, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation, depletion, amortization and accretion	$ 8,358	$ 59,018	$ 28,708	$ 99,048	$ 60,889
General and administrative expenses	11,052	32,308	55,528	50,746	114,804
Reduction in value of assets					16,522
Loss from operations	(4,525)	(36,451)	(26,080)	(65,327)	(37,333)
Other income (expense)	(2,105)	2,570	821	(275)	(3,411)
Income (loss) from discontinued operations, net of income tax	(352)	(19,400)	(19,414)	(28,806)	(68,088)
Pumpco [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	10,719	45,114	32,485	68,366	119,996
Cost of services	10,398	35,459	36,450	55,481	116,081
Depreciation, depletion, amortization and accretion	2,141	18,581	8,034	31,356	17,206
General and administrative expenses	1,119	3,623	3,505	6,218	17,475
Reduction in value of assets		12,430	3,003	12,430	49,361
Loss from operations	(2,939)	(24,979)	(18,507)	(37,119)	(80,127)
Other income (expense)	2,485	(53)	8	(50)	15
Loss from discontinued operations before tax	(454)	(25,032)	(18,499)	(37,169)	(80,112)
Income tax expense (benefit)	102	5,632	(915)	8,363	12,024
Income (loss) from discontinued operations, net of income tax	$ (352)	$ (19,400)	$ (19,414)	$ (28,806)	$ (68,088)