Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues:
Total revenues	$ 43,846
Operating costs and expenses:
Lease operating expenses	23,200
Cost of purchased natural gas	399
Dry hole and exploration costs	39
Production taxes	2,193
Accretion expense on obligations	2,210
Depreciation, depletion and amortization	4,972
General and administrative expenses	6,370
Impairment of oil and natural gas properties	26,128
Gain on sales of oil and natural gas properties	(13)
Total operating costs and expenses	65,498
Operating loss	(21,652)
Other income (expense), net:
Gain (loss) on derivatives, net	(16,774)
Interest expense	(1,519)
Gain on equity securities	4,593
Other income (expense), net	(138)
Total other income (expense), net	(13,838)
Loss before income taxes	(35,490)
Income tax expense	(285)
Net loss	$ (35,775)
Basic and diluted earnings per share / unit:
Net loss	$ (3.56)
Weighted average common shares / units outstanding:
Basic, share/unit	10,043
Diluted, share/unit	10,043
Oil, natural gas and natural gas liquids revenues
Revenues:
Total revenues	$ 43,286
Transportation and marketing-related revenues
Revenues:
Total revenues	$ 560
Predecessor
Revenues:
Total revenues		$ 67,942
Operating costs and expenses:
Lease operating expenses		27,544
Cost of purchased natural gas		315
Dry hole and exploration costs		82
Production taxes		3,525
Accretion expense on obligations		1,897
Depreciation, depletion and amortization		27,002
General and administrative expenses		7,725
Restructuring costs		5,211
Impairment of oil and natural gas properties		3
Gain on sales of oil and natural gas properties		(2)
Total operating costs and expenses		73,302
Operating loss		(5,360)
Other income (expense), net:
Gain (loss) on derivatives, net		399
Interest expense		(10,476)
Other income (expense), net		302
Total other income (expense), net		(9,775)
Loss before income taxes		(15,135)
Income tax expense		(314)
Net loss		$ (15,449)
Basic and diluted earnings per share / unit:
Net loss		$ (0.31)
Weighted average common shares / units outstanding:
Basic, share/unit		49,369
Diluted, share/unit		49,369
Predecessor | Oil, natural gas and natural gas liquids revenues
Revenues:
Total revenues		$ 67,558
Predecessor | Transportation and marketing-related revenues
Revenues:
Total revenues		384
Predecessor | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenues:
Total revenues		67,942
Predecessor | Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Oil, natural gas and natural gas liquids revenues
Revenues:
Total revenues		67,558
Predecessor | Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Transportation and marketing-related revenues
Revenues:
Total revenues		$ 384