Industry Segment Information (Industry Segment Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020		Mar. 31, 2019
Revenues:
Revenues	$ 122,376		$ 189,691
Operating costs:
Operating costs	83,723		103,470
Depreciation, depletion, and amortization	61,617		62,126
Impairments	741,924		0
Total expenses	887,264		165,596
Loss on abandonment of assets	17,554		0
General and administrative	11,553		9,741
(Gain) loss on disposition of assets	390		1,615
Income (loss) from operations	(794,385)		12,739
Gain (loss) on derivatives	483		(6,932)
Interest, net	(13,257)		(8,538)
Other	60		5
Income (loss) before income taxes	(807,099)		(2,726)
Oil and Natural Gas [Member]
Revenues:
Revenues	48,524		86,095
Operating costs:
Operating costs	31,415		34,008
Depreciation, depletion, and amortization	36,728		35,767
Impairments	267,836
Total expenses	335,979		69,775
Loss on abandonment of assets	17,554
General and administrative	0		0
(Gain) loss on disposition of assets	(13)		(79)
Income (loss) from operations	(304,996)		16,399
Gain (loss) on derivatives	0		0
Interest, net	0		0
Other	18		0
Income (loss) before income taxes	(304,978)		16,399
Drilling [Member]
Revenues:
Revenues	36,632		58,199
Operating costs:
Operating costs	25,449		37,385
Depreciation, depletion, and amortization	11,745		12,699
Impairments	410,126
Total expenses	447,320		50,084
Loss on abandonment of assets	0
General and administrative	0		0
(Gain) loss on disposition of assets	409		1,746
Income (loss) from operations	(411,097)		6,369
Gain (loss) on derivatives	0		0
Interest, net	0		0
Other	17		0
Income (loss) before income taxes	(411,080)		6,369
Mid-Stream [Member]
Revenues:
Revenues	42,680		70,509
Operating costs:
Operating costs	32,319		56,129
Depreciation, depletion, and amortization	12,273		11,726
Impairments	63,962
Total expenses	108,554		67,855
Loss on abandonment of assets	0
General and administrative	0		0
(Gain) loss on disposition of assets	(6)		(42)
Income (loss) from operations	(65,868)		2,696
Gain (loss) on derivatives	0		0
Interest, net	(518)		(336)
Other	18		0
Income (loss) before income taxes	(66,368)		2,360
Corporate and Other [Member]
Revenues:
Revenues	0		0
Operating costs:
Operating costs	0		0
Depreciation, depletion, and amortization	871		1,934
Impairments	0
Total expenses	871		1,934
Loss on abandonment of assets	0
General and administrative	11,553		9,741
(Gain) loss on disposition of assets	0		(10)
Income (loss) from operations	(12,424)		(11,665)
Gain (loss) on derivatives	483		(6,932)
Interest, net	(12,739)		(8,202)
Other	7		5
Income (loss) before income taxes	(24,673)		(26,794)
Eliminations [Member]
Revenues:
Revenues	(5,460)		(25,112)
Operating costs:
Operating costs	(5,460)		(24,052)
Depreciation, depletion, and amortization	0		0
Impairments	0
Total expenses	(5,460)		(24,052)
Loss on abandonment of assets	0
General and administrative	0		0
(Gain) loss on disposition of assets	0		0
Income (loss) from operations	0		(1,060)
Gain (loss) on derivatives	0		0
Interest, net	0		0
Other	0		0
Income (loss) before income taxes	0		(1,060)
Oil and natural gas
Revenues:
Revenues	48,522		86,095
Operating costs:
Operating costs	30,663		32,714
Oil and natural gas | Oil and Natural Gas [Member]
Revenues:
Revenues	48,524	[1]	86,095	[2]
Operating costs:
Operating costs	31,415		34,008
Oil and natural gas | Drilling [Member]
Revenues:
Revenues	0	[1]	0	[2]
Operating costs:
Operating costs	0		0
Oil and natural gas | Mid-Stream [Member]
Revenues:
Revenues	0	[1]	0	[2]
Operating costs:
Operating costs	0		0
Oil and natural gas | Corporate and Other [Member]
Revenues:
Revenues	0	[1]	0	[2]
Operating costs:
Operating costs	0		0
Oil and natural gas | Eliminations [Member]
Revenues:
Revenues	(2)	[1]	0	[2]
Operating costs:
Operating costs	(752)		(1,294)
Contract drilling
Revenues:
Revenues	36,632		51,155
Operating costs:
Operating costs	25,449		31,401
Contract drilling | Oil and Natural Gas [Member]
Revenues:
Revenues	0	[1]	0	[2]
Operating costs:
Operating costs	0		0
Contract drilling | Drilling [Member]
Revenues:
Revenues	36,632	[1]	58,199	[2]
Operating costs:
Operating costs	25,449		37,385
Contract drilling | Mid-Stream [Member]
Revenues:
Revenues	0	[1]	0	[2]
Operating costs:
Operating costs	0		0
Contract drilling | Corporate and Other [Member]
Revenues:
Revenues	0	[1]	0	[2]
Operating costs:
Operating costs	0		0
Contract drilling | Eliminations [Member]
Revenues:
Revenues	0	[1]	(7,044)	[2]
Operating costs:
Operating costs	0		(5,984)
Gas gathering and processing
Revenues:
Revenues	37,222		52,441
Operating costs:
Operating costs	27,611		39,355
Gas gathering and processing | Oil and Natural Gas [Member]
Revenues:
Revenues	0	[1]	0	[2]
Operating costs:
Operating costs	0		0
Gas gathering and processing | Drilling [Member]
Revenues:
Revenues	0	[1]	0	[2]
Operating costs:
Operating costs	0		0
Gas gathering and processing | Mid-Stream [Member]
Revenues:
Revenues	42,680	[1]	70,509	[2]
Operating costs:
Operating costs	32,319		56,129
Gas gathering and processing | Corporate and Other [Member]
Revenues:
Revenues	0	[1]	0	[2]
Operating costs:
Operating costs	0		0
Gas gathering and processing | Eliminations [Member]
Revenues:
Revenues	(5,458)	[1]	(18,068)	[2]
Operating costs:
Operating costs	$ (4,708)		$ (16,774)

[1] The revenues for oil and natural gas occur at a point in time. The revenues for contract drilling and gas gathering and processing occur over time.

[2] The revenues for oil and natural gas occur at a point in time. The revenues for contract drilling and gas gathering and processing occur over time.