Industry Segment Information (Industry Segment Information) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2017		Jun. 30, 2016		Jun. 30, 2017		Jun. 30, 2016
Revenues:
Oil and natural gas	$ 83,173		$ 69,190		$ 170,771		$ 127,464
Contract drilling	39,255		24,257		76,440		62,967
Gas gathering and processing	48,153		44,858		99,094		84,058
Total revenues	170,581		138,305		346,305		274,489
Operating costs:
Oil and natural gas	32,758		33,331		61,962		66,677
Contract drilling	27,239		19,254		56,466		47,352
Gas gathering and processing	36,042		32,381		73,746		63,447
Operating Costs and Expenses	96,039		84,966		192,174		177,476
Depreciation, depletion, and amortization	50,080		52,878		97,012		108,468
Impairments	0		74,291		0		112,120
Total expenses	146,119		212,135		289,186		398,064
General and administrative expense	(8,713)		(8,348)		(17,667)		(16,959)
Gain (loss) on disposition of assets	248		477		1,072		669
Gain (loss) on derivatives	8,902		(22,672)		23,633		(11,743)
Interest expense, net	(9,467)		(10,606)		(18,863)		(20,223)
Other	6		1		9		(14)
Income (loss) before income taxes	15,438		(114,978)		45,303		(171,845)
Oil and Natural Gas [Member]
Revenues:
Oil and natural gas	83,173		69,190		170,771		127,464
Contract drilling	0		0		0		0
Gas gathering and processing	0		0		0		0
Total revenues	83,173		69,190		170,771		127,464
Operating costs:
Oil and natural gas	33,941		35,555		64,267		70,361
Contract drilling	0		0		0		0
Gas gathering and processing	0		0		0		0
Operating Costs and Expenses	33,941		35,555		64,267		70,361
Depreciation, depletion, and amortization	23,558		30,411		45,084		62,243
Impairments			74,291				112,120
Total expenses	57,499		140,257		109,351		244,724
Total operating income (loss)	25,674	[1]	(71,067)	[2]	61,420		(117,260)	[3]
General and administrative expense	0		0		0		0
Gain (loss) on disposition of assets	168		(324)		177		(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	25,842		(71,391)		61,597		(117,584)
Drilling [Member]
Revenues:
Oil and natural gas	0		0		0		0
Contract drilling	44,844		24,257		82,029		62,967
Gas gathering and processing	0		0		0		0
Total revenues	44,844		24,257		82,029		62,967
Operating costs:
Oil and natural gas	0		0		0		0
Contract drilling	32,452		19,254		61,679		47,352
Gas gathering and processing	0		0		0		0
Operating Costs and Expenses	32,452		19,254		61,679		47,352
Depreciation, depletion, and amortization	13,769		10,918		26,616		23,113
Impairments			0				0
Total expenses	46,221		30,172		88,295		70,465
Total operating income (loss)	(1,377)	[1]	(5,915)	[2]	(6,266)	[4]	(7,498)	[3]
General and administrative expense	0		0		0		0
Gain (loss) on disposition of assets	31		815		38		1,316
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	(1,346)		(5,100)		(6,228)		(6,182)
Mid-Stream [Member]
Revenues:
Oil and natural gas	0		0		0		0
Contract drilling	0		0		0		0
Gas gathering and processing	63,111		56,533		129,575		105,578
Total revenues	63,111		56,533		129,575		105,578
Operating costs:
Oil and natural gas	0		0		0		0
Contract drilling	0		0		0		0
Gas gathering and processing	49,817		41,832		101,922		81,283
Operating Costs and Expenses	49,817		41,832		101,922		81,283
Depreciation, depletion, and amortization	10,849		11,515		21,667		22,974
Impairments			0				0
Total expenses	60,666		53,347		123,589		104,257
Total operating income (loss)	2,445	[1]	3,186	[2]	5,986	[4]	1,321	[3]
General and administrative expense	0		0		0		0
Gain (loss) on disposition of assets	44		0		44		(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	2,489		3,186		6,030		1,019
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
Operating Costs and Expenses	0		0		0		0
Depreciation, depletion, and amortization	1,904		34		3,645		138
Impairments			0				0
Total expenses	1,904		34		3,645		138
Total operating income (loss)	(1,904)	[1]	(34)	[2]	(3,645)	[4]	(138)	[3]
General and administrative expense	(8,713)		(8,348)		(17,667)		(16,959)
Gain (loss) on disposition of assets	5		(14)		813		(21)
Gain (loss) on derivatives	8,902		(22,672)		23,633		(11,743)
Interest expense, net	(9,467)		(10,606)		(18,863)		(20,223)
Other	6		1		9		(14)
Income (loss) before income taxes	(11,171)		(41,673)		(15,720)		(49,098)
Eliminations [Member]
Revenues:
Oil and natural gas	0		0		0		0
Contract drilling	(5,589)		0		(5,589)		0
Gas gathering and processing	(14,958)		(11,675)		(30,481)		(21,520)
Total revenues	(20,547)		(11,675)		(36,070)		(21,520)
Operating costs:
Oil and natural gas	(1,183)		(2,224)		(2,305)		(3,684)
Contract drilling	(5,213)		0		(5,213)		0
Gas gathering and processing	(13,775)		(9,451)		(28,176)		(17,836)
Operating Costs and Expenses	(20,171)		(11,675)		(35,694)		(21,520)
Depreciation, depletion, and amortization	0		0		0		0
Impairments			0				0
Total expenses	(20,171)		(11,675)		(35,694)		(21,520)
Total operating income (loss)	(376)	[1]	0	[2]	(376)	[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	$ (376)		$ 0		$ (376)		$ 0

[1] 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.

[2] 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.

[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.