Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	May 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues:
Revenues		$ 138,600
Operating costs and expenses:
Lease operating expenses		64,100
Cost of purchased natural gas		1,026
Dry hole and exploration costs		177
Production taxes		6,482
Accretion expense on obligations		5,420
Depreciation, depletion and amortization		16,012
General and administrative expenses		15,626
Impairment of oil and natural gas properties		3,065
(Gain) loss on sales of oil and natural gas properties		(697)
Total operating costs and expenses		111,211
Operating income (loss)		27,389
Other income (expense), net:
Gain (loss) on derivatives, net		16,962
Interest expense		(7,225)
Loss on equity securities		(11,130)
Other income, net		374
Total other income (expense), net		(1,019)
Reorganization items, net		(2,323)
Income (loss) before income taxes		24,047
Income (loss) before income taxes		24,047
Income tax (expense) benefit		(78)
Net income (loss)		$ 23,969
Basic and diluted earnings per share / unit:
Net income (loss)		$ 2.39
Weighted average common shares / units outstanding:
Basic, share/unit		10,030
Diluted, share/unit		10,032
Predecessor
Revenues:
Revenues	$ 111,031		$ 225,693	$ 184,894
Operating costs and expenses:
Lease operating expenses	45,372		101,591	103,371
Cost of purchased natural gas	557		1,699	1,497
Dry hole and exploration costs	122		413	651
Production taxes	5,343		10,588	7,386
Accretion expense on obligations	3,176		7,653	8,225
Depreciation, depletion and amortization	46,196		96,901	119,171
General and administrative expenses	15,648		32,290	33,637
Restructuring Costs	5,211
Impairment of oil and natural gas properties	3		93,607	131,260
Gain on settlement of contract				(3,185)
(Gain) loss on sales of oil and natural gas properties	5		(981)	(69)
Total operating costs and expenses	121,633		343,761	401,944
Operating income (loss)	(10,602)		(118,068)	(217,050)
Other income (expense), net:
Gain (loss) on derivatives, net	444		22,854	(35,950)
Interest expense	(13,652)		(40,903)	(42,487)
Gain on early extinguishment of debt				47,695
Other income, net	776		1,706	2,522
Total other income (expense), net	(12,432)		(16,343)	(28,220)
Reorganization items, net	(587,325)
Income (loss) before income taxes	(610,359)		(134,411)	(245,270)
Income (loss) before income taxes	(610,359)		(134,411)	(245,270)
Income tax (expense) benefit	(166)		210	2,375
Net income (loss)	$ (610,525)		$ (134,201)	$ (242,895)
Basic and diluted earnings per share / unit:
Net income (loss)	$ (12.12)		$ (2.66)	$ (4.85)
Weighted average common shares / units outstanding:
Basic, share/unit	49,369		49,357	49,048
Diluted, share/unit	49,369		49,357	49,048
Oil And Gas [Member]
Revenues:
Revenues		$ 137,169
Oil And Gas [Member] | Predecessor
Revenues:
Revenues	$ 110,307		$ 223,297	$ 182,696
Transportation And Marketing Revenue [Member]
Revenues:
Revenues		$ 1,431
Transportation And Marketing Revenue [Member] | Predecessor
Revenues:
Revenues	$ 724		$ 2,396	$ 2,198