Reporting Segments (Segment Information) (Details) - USD ($) $ in Thousands	2 Months Ended	10 Months Ended	12 Months Ended
	Mar. 05, 2015	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Operating Revenues
Natural gas sales			$ 10,408	$ 19,809
Oil sales			5,138	35,297
Natural gas liquids sales			1,167	1,597
Gathering and transportation sales			53,972	11,725
Total revenues			70,685	68,428
Operating expenses:
Lease operating expenses			14,981	19,988
Transportation operating expenses			12,478	2,176
Cost of sales			328	595
Production taxes			1,167	1,792
General and administrative			22,901	23,655
Unit compensation expense			1,941	2,454
Exploration costs				1,866
Loss on sale of assets			219	(111)
Depreciation, depletion and amortization			33,799	14,536
Asset impairments	$ 0	$ 123,800	7,646	123,860
Accretion expense			1,127	1,099
Total operating expenses			96,587	191,910
Operating income (loss)			(25,902)	(123,482)
Upstream
Operating Revenues
Natural gas sales			10,408	19,809
Oil sales			5,138	35,297
Natural gas liquids sales			1,167	1,597
Total revenues			16,713	56,703
Operating expenses:
Lease operating expenses			14,327	19,890
Cost of sales			328	595
Production taxes			1,167	1,792
General and administrative			17,178	23,655
Unit compensation expense			1,941	2,454
Exploration costs				1,866
Loss on sale of assets			219	(111)
Depreciation, depletion and amortization			6,722	10,330
Asset impairments			7,646	123,860
Accretion expense			875	1,048
Total operating expenses			50,403	185,379
Operating income (loss)			(33,690)	(128,676)
Midstream
Operating Revenues
Gathering and transportation sales			53,972	11,725
Total revenues			53,972	11,725
Operating expenses:
Lease operating expenses			654	98
Transportation operating expenses			12,478	2,176
General and administrative			5,723
Depreciation, depletion and amortization			27,077	4,206
Accretion expense			252	51
Total operating expenses			46,184	6,531
Operating income (loss)			$ 7,788	$ 5,194