Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues:
Total revenues	$ 425,717	$ 573,068	$ 1,329,208	$ 1,590,934
Costs and expenses:
Costs (exclusive of depreciation, depletion, amortization and accretion)	294,206	404,389	920,797	1,117,659
Depreciation, depletion, amortization and accretion	67,389	99,892	225,046	303,584
General and administrative expenses	62,768	68,895	208,597	214,611
Reduction in value of assets	9,571		40,952
Loss from operations	(8,217)	(108)	(66,184)	(44,920)
Other expense:
Interest expense, net	(24,505)	(24,952)	(74,275)	(74,733)
Other income (expense)	(3,353)	(277)	(4,476)	(4,394)
Loss from continuing operations before income taxes	(36,075)	(25,337)	(144,935)	(124,047)
Income taxes	2,366	(3,521)	12,261	(16,846)
Net loss from continuing operations	(38,441)	(21,816)	(157,196)	(107,201)
Loss from discontinued operations, net of income tax				(729)
Net loss	$ (38,441)	$ (21,816)	$ (157,196)	$ (107,930)
Basic and diluted loss per share:
Net loss from continuing operations	$ (0.25)	$ (0.14)	$ (1.01)	$ (0.70)
Loss from discontinued operations
Net loss	$ (0.25)	$ (0.14)	$ (1.01)	$ (0.70)
Weighted average shares outstanding	156,573	154,529	155,808	154,047
Services [Member]
Revenues:
Total revenues	$ 325,946	$ 471,218	$ 1,046,388	$ 1,317,798
Costs and expenses:
Costs (exclusive of depreciation, depletion, amortization and accretion)	255,087	372,837	801,143	1,017,102
Depreciation, depletion, amortization and accretion	51,889	81,911	178,088	251,398
Rentals [Member]
Revenues:
Total revenues	99,771	101,850	282,820	273,136
Costs and expenses:
Costs (exclusive of depreciation, depletion, amortization and accretion)	39,119	31,552	119,654	100,557
Depreciation, depletion, amortization and accretion	$ 15,500	$ 17,981	$ 46,958	$ 52,186