Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		4 Months Ended	5 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2018	May 31, 2018	Sep. 30, 2019
Revenues:
Total revenues	$ 23,249	$ 68,966	$ 90,686		$ 97,682
Operating costs and expenses:
Lease operating expenses	19,614	28,281	37,656		64,568
Cost of purchased natural gas	255	393	522		969
Dry hole and exploration costs	36	21	64		75
Production taxes	1,634	2,973	3,943		5,277
Accretion expense on obligations	1,995	2,345	3,134		6,373
Depreciation, depletion and amortization	1,367	7,860	10,590		10,712
General and administrative expenses	7,771	7,673	9,702		20,794
Impairment of oil and natural gas properties	16,325	2,565	2,565		115,604
(Gain) loss on sales of oil and natural gas properties	(661)	(28)	(47)		(679)
Total operating costs and expenses	48,336	52,083	68,129		223,693
Operating income (loss)	(25,087)	16,883	22,557		(126,011)
Other income (expense), net:
Gain (loss) on derivatives, net	5,718	(26,423)	(30,655)		5,374
Interest expense	(501)	(3,967)	(5,166)		(3,335)
Gain on equity securities		4,830	4,830		4,593
Other income (expense), net	341	(111)	(84)		3,168
Total other income (expense), net	5,558	(25,671)	(31,075)		9,800
Reorganization items, net		(972)	(1,780)
Loss before income taxes	(19,529)	(9,760)	(10,298)		(116,211)
Net loss	$ (19,529)	$ (9,760)	$ (10,298)		$ (116,211)
Basic and diluted earnings per share:
Net loss	$ (1.93)	$ (0.97)	$ (1.03)		$ (11.53)
Weighted average common shares / units outstanding:
Basic, share/unit	10,131	10,028	10,021		10,080
Diluted, share/unit	10,131	10,028	10,021		10,080
Oil, natural gas and natural gas liquids revenues
Revenues:
Total revenues	$ 22,870	$ 68,407	$ 89,942		$ 96,285
Transportation and marketing–related revenues
Revenues:
Total revenues	$ 379	$ 559	$ 744		$ 1,397
Predecessor [Member]
Revenues:
Total revenues				$ 111,031
Operating costs and expenses:
Lease operating expenses				45,372
Cost of purchased natural gas				557
Dry hole and exploration costs				122
Production taxes				5,343
Accretion expense on obligations				3,176
Depreciation, depletion and amortization				46,196
General and administrative expenses				15,648
Restructuring costs				5,211
Impairment of oil and natural gas properties				3
(Gain) loss on sales of oil and natural gas properties				5
Total operating costs and expenses				121,633
Operating income (loss)				(10,602)
Other income (expense), net:
Gain (loss) on derivatives, net				444
Interest expense				(13,652)
Other income (expense), net				776
Total other income (expense), net				(12,432)
Reorganization items, net				(587,325)
Loss before income taxes				(610,359)
Income tax benefit (expense)				(166)
Net loss				$ (610,525)
Basic and diluted earnings per share:
Net loss				$ (12.12)
Weighted average common shares / units outstanding:
Basic, share/unit				49,369
Diluted, share/unit				49,369
Predecessor [Member] | Oil, natural gas and natural gas liquids revenues
Revenues:
Total revenues				$ 110,307
Predecessor [Member] | Transportation and marketing–related revenues
Revenues:
Total revenues				$ 724