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, 2015	Dec. 31, 2014
Operating Revenues
Natural gas sales			$ 19,809	$ 34,458
Oil sales			35,297	40,337
Natural gas liquid sales			1,597	2,477
Gathering and transportation sales			11,725
Total revenues			68,428	77,272
Operating expenses:
Lease operating expenses			19,988	21,012
Transportation operating expenses			2,176
Cost of sales			595	1,487
Production taxes			1,792	3,200
General and administrative			26,109	16,499
Exploration costs			1,866
(Gain) loss on sale of assets			(111)	223
Depreciation, depletion and amortization			14,536	17,533
Asset impairments	$ 0	$ 123,800	123,860	5,424
Accretion expense			1,099	604
Total operating expenses			191,910	65,982
Operating income (loss)			(123,482)	11,290
Upstream [Member]
Operating Revenues
Natural gas sales			19,809	34,458
Oil sales			35,297	40,337
Natural gas liquid sales			1,597	2,477
Total revenues			56,703	77,272
Operating expenses:
Lease operating expenses			19,890	21,012
Cost of sales			595	1,487
Production taxes			1,792	3,200
General and administrative			26,109	16,499
Exploration costs			1,866
(Gain) loss on sale of assets			(111)	223
Depreciation, depletion and amortization			10,330	17,533
Asset impairments			123,860	5,424
Accretion expense			1,048	604
Total operating expenses			185,379	65,982
Operating income (loss)			(128,676)	$ 11,290
Midstream [Member]
Operating Revenues
Gathering and transportation sales			11,725
Total revenues			11,725
Operating expenses:
Lease operating expenses			98
Transportation operating expenses			2,176
Depreciation, depletion and amortization			4,206
Accretion expense			51
Total operating expenses			6,531
Operating income (loss)			$ 5,194