Industry Segment Information (Industry Segment Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017		Mar. 31, 2016
Revenues:
Oil and natural gas	$ 87,598		$ 58,274
Contract drilling	37,185		38,710
Gas gathering and processing	50,941		39,200
Total revenues	175,724		136,184
Operating costs:
Oil and natural gas	29,204		33,346
Contract drilling	29,227		28,098
Gas gathering and processing	37,704		31,066
Operating Costs and Expenses	96,135		92,510
Depreciation, depletion, and amortization	46,932		55,590
Impairments	0		37,829
Total expenses	143,067		185,929
General and administrative expense	(8,954)		(8,611)
Gain (loss) on disposition of assets	824		192
Gain on derivatives	14,731		10,929
Interest expense, net	(9,396)		(9,617)
Other	3		(15)
Income (loss) before income taxes	29,865		(56,867)
Oil and Natural Gas [Member]
Revenues:
Oil and natural gas	87,598		58,274
Contract drilling	0		0
Gas gathering and processing	0		0
Total revenues	87,598		58,274
Operating costs:
Oil and natural gas	30,326		34,804
Contract drilling	0		0
Gas gathering and processing	0		0
Operating Costs and Expenses	30,326		34,804
Depreciation, depletion, and amortization	21,526		31,832
Impairments			37,829
Total expenses	51,852		104,465
Total operating income (loss)	35,746	[1]	(46,191)	[2]
General and administrative expense	0		0
Gain (loss) on disposition of assets	9		0
Gain on derivatives	0		0
Interest expense, net	0		0
Other	0		0
Income (loss) before income taxes	35,755		(46,191)
Drilling [Member]
Revenues:
Oil and natural gas	0		0
Contract drilling	37,185		38,710
Gas gathering and processing	0		0
Total revenues	37,185		38,710
Operating costs:
Oil and natural gas	0		0
Contract drilling	29,227		28,098
Gas gathering and processing	0		0
Operating Costs and Expenses	29,227		28,098
Depreciation, depletion, and amortization	12,847		12,195
Impairments			0
Total expenses	42,074		40,293
Total operating income (loss)	(4,889)	[1]	(1,583)	[2]
General and administrative expense	0		0
Gain (loss) on disposition of assets	7		494
Gain on derivatives	0		0
Interest expense, net	0		0
Other	0		0
Income (loss) before income taxes	(4,882)		(1,089)
Mid-Stream [Member]
Revenues:
Oil and natural gas	0		0
Contract drilling	0		0
Gas gathering and processing	66,464		49,045
Total revenues	66,464		49,045
Operating costs:
Oil and natural gas	0		0
Contract drilling	0		0
Gas gathering and processing	52,105		39,453
Operating Costs and Expenses	52,105		39,453
Depreciation, depletion, and amortization	10,818		11,459
Impairments			0
Total expenses	62,923		50,912
Total operating income (loss)	3,541	[1]	(1,867)	[2]
General and administrative expense	0		0
Gain (loss) on disposition of assets	0		(302)
Gain on derivatives	0		0
Interest expense, net	0		0
Other	0		0
Income (loss) before income taxes	3,541		(2,169)
Other Segments [Member]
Revenues:
Oil and natural gas	0		0
Contract drilling	0		0
Gas gathering and processing	0		0
Total revenues	0		0
Operating costs:
Oil and natural gas	0		0
Contract drilling	0		0
Gas gathering and processing	0		0
Operating Costs and Expenses	0		0
Depreciation, depletion, and amortization	1,741		104
Impairments			0
Total expenses	1,741		104
Total operating income (loss)	(1,741)	[1]	(104)	[2]
General and administrative expense	(8,954)		(8,611)
Gain (loss) on disposition of assets	808		0
Gain on derivatives	14,731		10,929
Interest expense, net	(9,396)		(9,617)
Other	3		(15)
Income (loss) before income taxes	(4,549)		(7,418)
Eliminations [Member]
Revenues:
Oil and natural gas	0		0
Contract drilling	0		0
Gas gathering and processing	(15,523)		(9,845)
Total revenues	(15,523)		(9,845)
Operating costs:
Oil and natural gas	(1,122)		(1,458)
Contract drilling	0		0
Gas gathering and processing	(14,401)		(8,387)
Operating Costs and Expenses	(15,523)		(9,845)
Depreciation, depletion, and amortization	0		0
Impairments			0
Total expenses	(15,523)		(9,845)
Total operating income (loss)	0	[1]	0	[2]
General and administrative expense	0		0
Gain (loss) on disposition of assets	0		0
Gain on derivatives	0		0
Interest expense, net	0		0
Other	0		0
Income (loss) before income taxes	$ 0		$ 0

[1] 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.

[2] Operating 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, gain on derivatives, interest expense, other income (loss), or income taxes.