Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended	5 Months Ended	6 Months Ended
	Jun. 30, 2018	May 31, 2018	Jun. 30, 2019	May 31, 2018	Jun. 30, 2019
Revenues:
Total revenues	$ 21,720		$ 30,587		$ 74,433
Operating costs and expenses:
Lease operating expenses	9,375		21,754		44,954
Cost of purchased natural gas	129		315		714
Dry hole and exploration costs	43				39
Production taxes	970		1,450		3,643
Accretion expense on obligations	789		2,168		4,378
Depreciation, depletion and amortization	2,730		4,373		9,345
General and administrative expenses	2,029		6,653		13,023
Impairment of oil and natural gas properties			73,151		99,279
(Gain) loss on sales of oil and natural gas properties	(19)		(5)		(18)
Total operating costs and expenses	16,046		109,859		175,357
Operating income (loss)	5,674		(79,272)		(100,924)
Other income (expense), net:
Gain (loss) on derivatives, net	(4,232)		16,430		(344)
Interest expense	(1,199)		(1,315)		(2,834)
Gain on equity securities					4,593
Other income (expense), net	27		2,965		2,827
Total other income (expense), net	(5,404)		18,080		4,242
Reorganization items, net	(808)
Loss before income taxes	(538)		(61,192)		(96,682)
Income tax benefit (expense)			285
Net loss	$ (538)		$ (60,907)		$ (96,682)
Basic and diluted earnings per share / unit:
Net loss	$ (0.05)		$ (6.05)		$ (9.62)
Weighted average common shares / units outstanding:
Basic, share/unit	10,000		10,064		10,053
Diluted, share/unit	10,000		10,064		10,053
Oil, natural gas and natural gas liquids revenues
Revenues:
Total revenues	$ 21,535		$ 30,129		$ 73,415
Transportation and marketing-related revenues
Revenues:
Total revenues	$ 185		$ 458		$ 1,018
Predecessor
Revenues:
Total revenues		$ 43,089		$ 111,031
Operating costs and expenses:
Lease operating expenses		17,828		45,372
Cost of purchased natural gas		242		557
Dry hole and exploration costs		40		122
Production taxes		1,818		5,343
Accretion expense on obligations		1,279		3,176
Depreciation, depletion and amortization		19,194		46,196
General and administrative expenses		7,923		15,648
Restructuring costs				5,211
Impairment of oil and natural gas properties				3
(Gain) loss on sales of oil and natural gas properties		7		5
Total operating costs and expenses		48,331		121,633
Operating income (loss)		(5,242)		(10,602)
Other income (expense), net:
Gain (loss) on derivatives, net		45		444
Interest expense		(3,176)		(13,652)
Other income (expense), net		474		776
Total other income (expense), net		(2,657)		(12,432)
Reorganization items, net		(587,325)		(587,325)
Loss before income taxes		(595,224)		(610,359)
Income tax benefit (expense)		148		(166)
Net loss		$ (595,076)		$ (610,525)
Basic and diluted earnings per share / unit:
Net loss		$ (11.81)		$ (12.12)
Weighted average common shares / units outstanding:
Basic, share/unit		49,369		49,369
Diluted, share/unit		49,369		49,369
Predecessor | Oil, natural gas and natural gas liquids revenues
Revenues:
Total revenues		$ 42,749		$ 110,307
Predecessor | Transportation and marketing-related revenues
Revenues:
Total revenues		$ 340		$ 724