Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues:
Total revenues	$ 436,315	$ 535,548	$ 903,491	$ 1,017,866
Costs and expenses:
Costs (exclusive of depreciation, depletion, amortization and accretion)	296,428	369,810	626,591	713,270
Depreciation, depletion, amortization and accretion	75,218	97,973	157,657	203,692
General and administrative expenses	71,984	69,896	145,829	145,716
Reduction in value of assets	31,381		31,381
Loss from operations	(38,696)	(2,131)	(57,967)	(44,812)
Other expense:
Interest expense, net	(24,650)	(24,894)	(49,771)	(49,781)
Other income (expense)	490	(2,382)	(1,122)	(4,117)
Loss from continuing operations before income taxes	(62,856)	(29,407)	(108,860)	(98,710)
Income taxes	8,194	(3,970)	9,895	(13,325)
Net loss from continuing operations	(71,050)	(25,437)	(118,755)	(85,385)
Loss from discontinued operations, net of income tax		(953)		(729)
Net loss	$ (71,050)	$ (26,390)	$ (118,755)	$ (86,114)
Basic and diluted loss per share:
Net loss from continuing operations	$ (0.46)	$ (0.16)	$ (0.76)	$ (0.56)
Loss from discontinued operations		(0.01)
Net loss	$ (0.46)	$ (0.17)	$ (0.76)	$ (0.56)
Weighted average shares outstanding	155,997	154,278	155,383	153,728
Services [Member]
Revenues:
Total revenues	$ 344,304	$ 446,812	$ 720,443	$ 846,580
Costs and expenses:
Costs (exclusive of depreciation, depletion, amortization and accretion)	257,578	333,126	546,132	644,265
Depreciation, depletion, amortization and accretion	59,423	81,740	126,199	169,487
Rentals [Member]
Revenues:
Total revenues	92,011	88,736	183,048	171,286
Costs and expenses:
Costs (exclusive of depreciation, depletion, amortization and accretion)	38,850	36,684	80,459	69,005
Depreciation, depletion, amortization and accretion	$ 15,795	$ 16,233	$ 31,458	$ 34,205