CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Operating revenues:
Total operating revenues		$ 704,171	$ 809,164
Operating costs and expenses:
Depreciation, depletion, amortization and impairment		214,410	209,892
Selling, general and administrative		32,555	32,817
Merger and integration expenses			1,991
Other operating income, net	[1]	(8,736)	(2,421)
Total operating costs and expenses		727,554	831,266
Operating loss		(23,383)	(22,102)
Other income (expense):
Interest income		1,032	1,423
Interest expense, net of amount capitalized		(12,984)	(13,625)
Other		117	169
Total other expense		(11,835)	(12,033)
Loss before income taxes		(35,218)	(34,135)
Income tax expense (benefit)		(6,604)	282
Net loss		$ (28,614)	$ (34,417)
Net loss per common share:
Basic		$ (0.14)	$ (0.16)
Diluted		$ (0.14)	$ (0.16)
Weighted average number of common shares outstanding:
Basic		211,868	220,783
Diluted		211,868	220,783
Cash dividends per common share		$ 0.04	$ 0.02
Contract Drilling
Operating revenues:
Total operating revenues		$ 372,392	$ 327,803
Operating costs and expenses:
Operating costs and expenses		219,202	212,583
Pressure Pumping
Operating revenues:
Total operating revenues		247,601	406,784
Operating costs and expenses:
Operating costs and expenses		202,748	320,970
Directional Drilling
Operating revenues:
Total operating revenues		52,959	48,616
Operating costs and expenses:
Operating costs and expenses		45,602	37,689
Other
Operating revenues:
Total operating revenues		31,219	25,961
Operating costs and expenses:
Operating costs and expenses		$ 21,773	$ 17,745

[1] Other operating income, net includes net gains associated with the disposal of assets related to corporate strategy decisions of the executive management group. Accordingly, the related gains have been excluded from the operating results of specific segments. This caption also includes certain legal-related expenses and settlements, net of insurance reimbursements.