Industry Segment Information (Industry Segment Information) (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2017		Sep. 30, 2016		Sep. 30, 2017		Sep. 30, 2016
Revenues:
Oil and natural gas	$ 85,470		$ 78,854		$ 256,241		$ 206,318
Contract drilling	51,619		25,819		128,059		88,786
Gas gathering and processing	51,399		48,735		150,493		132,793
Total revenues	188,488		153,408		534,793		427,897
Operating costs:
Oil and natural gas	33,911		26,014		95,873		92,691
Contract drilling	34,747		19,137		91,213		66,489
Gas gathering and processing	38,116		35,738		111,862		99,185
Total operating costs	106,774		80,889		298,948		258,365
Depreciation, depletion, and amortization	54,533		49,969		151,545		158,437
Impairments	0		49,443		0		161,563
Total expenses	161,307		180,301		450,493		578,365
General and administrative expense	(9,235)		(8,852)		(26,902)		(25,811)
Gain (loss) on disposition of assets	81		154		1,153		823
Gain (loss) on derivatives	(2,614)		6,969		21,019		(4,774)
Interest expense, net	(9,944)		(10,002)		(28,807)		(30,225)
Other	5		3		14		(11)
Income (loss) before income taxes	5,474		(38,621)		50,777		(210,466)
Oil and Natural Gas [Member]
Revenues:
Oil and natural gas	85,470		78,854		256,241		206,318
Contract drilling	0		0		0		0
Gas gathering and processing	0		0		0		0
Total revenues	85,470		78,854		256,241		206,318
Operating costs:
Oil and natural gas	35,082		27,710		99,349		98,070
Contract drilling	0		0		0		0
Gas gathering and processing	0		0		0		0
Total operating costs	35,082		27,710		99,349		98,070
Depreciation, depletion, and amortization	26,460		27,135		71,544		89,378
Impairments			49,443				161,563
Total expenses	61,542		104,288		170,893		349,011
Total operating income (loss)	23,928	[1]	(25,434)	[2]	85,348		(142,693)	[3]
General and administrative expense	0		0		0		0
Gain (loss) on disposition of assets	(1)		0		176		(324)
Gain (loss) on derivatives	0		0		0		0
Interest expense, net	0		0		0		0
Other	0		0		0		0
Income (loss) before income taxes	23,927		(25,434)		85,524		(143,017)
Drilling [Member]
Revenues:
Oil and natural gas	0		0		0		0
Contract drilling	55,588		25,819		137,617		88,786
Gas gathering and processing	0		0		0		0
Total revenues	55,588		25,819		137,617		88,786
Operating costs:
Oil and natural gas	0		0		0		0
Contract drilling	38,115		19,137		99,794		66,489
Gas gathering and processing	0		0		0		0
Total operating costs	38,115		19,137		99,794		66,489
Depreciation, depletion, and amortization	15,280		11,318		41,896		34,431
Impairments			0				0
Total expenses	53,395		30,455		141,690		100,920
Total operating income (loss)	2,193	[1]	(4,636)	[2]	(4,073)	[4]	(12,134)	[3]
General and administrative expense	0		0		0		0
Gain (loss) on disposition of assets	68		151		106		1,467
Gain (loss) on derivatives	0		0		0		0
Interest expense, net	0		0		0		0
Other	0		0		0		0
Income (loss) before income taxes	2,261		(4,485)		(3,967)		(10,667)
Mid-Stream [Member]
Revenues:
Oil and natural gas	0		0		0		0
Contract drilling	0		0		0		0
Gas gathering and processing	69,057		63,090		198,632		168,668
Total revenues	69,057		63,090		198,632		168,668
Operating costs:
Oil and natural gas	0		0		0		0
Contract drilling	0		0		0		0
Gas gathering and processing	54,602		48,397		156,525		129,681
Total operating costs	54,602		48,397		156,525		129,681
Depreciation, depletion, and amortization	10,880		11,436		32,547		34,410
Impairments			0				0
Total expenses	65,482		59,833		189,072		164,091
Total operating income (loss)	3,575	[1]	3,257	[2]	9,560	[4]	4,577	[3]
General and administrative expense	0		0		0		0
Gain (loss) on disposition of assets	14		0		58		(302)
Gain (loss) on derivatives	0		0		0		0
Interest expense, net	0		0		0		0
Other	0		0		0		0
Income (loss) before income taxes	3,589		3,257		9,618		4,275
Other Segments [Member]
Revenues:
Oil and natural gas	0		0		0		0
Contract drilling	0		0		0		0
Gas gathering and processing	0		0		0		0
Total revenues	0		0		0		0
Operating costs:
Oil and natural gas	0		0		0		0
Contract drilling	0		0		0		0
Gas gathering and processing	0		0		0		0
Total operating costs	0		0		0		0
Depreciation, depletion, and amortization	1,913		80		5,558		218
Impairments			0				0
Total expenses	1,913		80		5,558		218
Total operating income (loss)	(1,913)	[1]	(80)	[2]	(5,558)	[4]	(218)	[3]
General and administrative expense	(9,235)		(8,852)		(26,902)		(25,811)
Gain (loss) on disposition of assets	0		3		813		(18)
Gain (loss) on derivatives	(2,614)		6,969		21,019		(4,774)
Interest expense, net	(9,944)		(10,002)		(28,807)		(30,225)
Other	5		3		14		(11)
Income (loss) before income taxes	(23,701)		(11,959)		(39,421)		(61,057)
Eliminations [Member]
Revenues:
Oil and natural gas	0		0		0		0
Contract drilling	(3,969)		0		(9,558)		0
Gas gathering and processing	(17,658)		(14,355)		(48,139)		(35,875)
Total revenues	(21,627)		(14,355)		(57,697)		(35,875)
Operating costs:
Oil and natural gas	(1,171)		(1,696)		(3,476)		(5,379)
Contract drilling	(3,368)		0		(8,581)		0
Gas gathering and processing	(16,486)		(12,659)		(44,663)		(30,496)
Total operating costs	(21,025)		(14,355)		(56,720)		(35,875)
Depreciation, depletion, and amortization	0		0		0		0
Impairments			0				0
Total expenses	(21,025)		(14,355)		(56,720)		(35,875)
Total operating income (loss)	(602)	[1]	0	[2]	(977)	[4]	0	[3]
General and administrative expense	0		0		0		0
Gain (loss) on disposition of assets	0		0		0		0
Gain (loss) on derivatives	0		0		0		0
Interest expense, net	0		0		0		0
Other	0		0		0		0
Income (loss) before income taxes	$ (602)		$ 0		$ (977)		$ 0

[1] Operating income (loss) is total operating revenues less operating expenses, depreciation, depletion, and amortization and does not include general corporate expenses, gain (loss) on disposition of assets, loss on derivatives, interest expense, other income (loss), or income taxes.

[2] Operating income (loss) is total operating revenues less operating expenses, depreciation, depletion, amortization, and impairment and does not include general corporate expenses, gain on disposition of assets, gain on derivatives, interest expense, other income (loss), or income taxes.

[3] Operating income (loss) is total operating revenues less operating expenses, depreciation, depletion, amortization, and impairment and does not include general corporate expenses, gain (loss) on disposition of assets, loss on derivatives, interest expense, other income (loss), or income taxes.

[4] Operating income (loss) is total operating revenues less operating expenses, depreciation, depletion, and amortization and does not include general corporate expenses, gain on disposition of assets, gain on derivatives, interest expense, other income (loss), or income taxes.