Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues:
Total revenues	$ 166,928	$ 356,585	$ 672,278	$ 1,089,297
Costs and expenses:
Cost of revenues (exclusive of depreciation, depletion, amortization and accretion)	116,233	231,927	456,722	701,512
Depreciation, depletion, amortization and accretion	35,172	45,162	113,313	152,776
General and administrative expenses	54,966	60,866	178,543	203,015
Restructuring expense	25,746		27,033
Reduction in value of assets	2,929	9,571	19,451	17,128
Income (loss) from operations	(68,118)	9,059	(122,784)	14,866
Other income (expense):
Interest expense, net	(24,794)	(24,505)	(74,677)	(74,275)
Other income (expense):	(1,399)	(3,353)	(4,810)	(4,476)
Loss from continuing operations before income taxes	(94,311)	(18,799)	(202,271)	(63,885)
Income taxes	4,990	1,708	(11,772)	7,707
Net loss from continuing operations	(99,301)	(20,507)	(190,499)	(71,592)
Loss from discontinued operations, net of income tax	(58,003)	(17,934)	(111,375)	(85,604)
Net loss	$ (157,304)	$ (38,441)	$ (301,874)	$ (157,196)
Basic and diluted loss per share:
Net loss from continuing operations	$ (6.70)	$ (1.31)	$ (12.87)	$ (4.60)
Loss from discontinued operations	(3.91)	(1.15)	(7.53)	(5.49)
Net loss	$ (10.61)	$ (2.46)	$ (20.40)	$ (10.09)
Weighted average shares outstanding	14,827	15,657	14,795	15,581
Services [Member]
Revenues:
Total revenues	$ 97,001	$ 211,540	$ 367,846	$ 689,248
Costs and expenses:
Cost of revenues (exclusive of depreciation, depletion, amortization and accretion)	81,535	162,469	303,134	510,075
Depreciation, depletion, amortization and accretion	20,400	26,646	61,584	96,594
Rentals [Member]
Revenues:
Total revenues	42,562	99,771	196,006	282,819
Costs and expenses:
Cost of revenues (exclusive of depreciation, depletion, amortization and accretion)	22,879	39,119	83,904	119,656
Depreciation, depletion, amortization and accretion	9,145	15,500	32,633	46,958
Product Sales [Member]
Revenues:
Total revenues	27,365	45,274	108,426	117,230
Costs and expenses:
Cost of revenues (exclusive of depreciation, depletion, amortization and accretion)	11,819	30,339	69,684	71,781
Depreciation, depletion, amortization and accretion	$ 5,627	$ 3,016	$ 19,096	$ 9,224