Consolidated Statements Of Operations - USD ($) $ in Thousands	1 Months Ended	11 Months Ended	12 Months Ended
	Feb. 08, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue
Operating revenue		$ 414,507
Gain on sale of assets		4,751
Gain on acquisitions of oil and gas properties		0
Gain (loss) on derivatives		(10,247)
Total revenue		409,011
Operating expenses
Lease operating		60,547
Transportation and marketing		50,038
Production taxes		16,865
Workovers		5,563
Exploration		34,085
Depreciation, depletion and amortization		133,554
Impairment of assets		2,033,712
General and administrative		114,735
Total operating expenses		2,449,099
Operating income		(2,040,088)
Other income (expense)
Interest expense		(38,265)
Interest income and other		1,983
Loss on debt extinguishment		0
Total other income (expense), net		(36,282)
Loss from continuing operations before income taxes		(2,076,370)
Income tax provision (benefit)		4
Loss from continuing operations		(2,076,374)
Loss from discontinued operations, net of tax		0
Net loss		(2,076,374)
Oil
Revenue
Operating revenue		323,299
Natural gas
Revenue
Operating revenue		43,407
Natural gas liquids
Revenue
Operating revenue		43,039
Other
Revenue
Operating revenue		$ 4,762
Predecessor
Revenue
Operating revenue	$ 40,136		$ 269,386	$ 142,356
Gain on sale of assets	840		28	3
Gain on acquisitions of oil and gas properties	0		1,668	0
Gain (loss) on derivatives	6,663		8,287	(40,460)
Total revenue	47,639		279,369	101,899
Operating expenses
Lease operating	4,408		43,953	29,567
Transportation and marketing	3,725		29,460	11,628
Production taxes	953		5,494	2,765
Workovers	423		4,255	3,441
Exploration	7,003		13,563	17,230
Depreciation, depletion and amortization	11,670		89,115	53,755
Impairment of assets	0		1,188	382
General and administrative	21,234		55,671	40,468
Total operating expenses	49,416		242,699	159,236
Operating income	(1,777)		36,670	(57,337)
Other income (expense)
Interest expense	(5,511)		(50,585)	(59,675)
Interest income and other	172		1,075	884
Loss on debt extinguishment	0		0	(18,151)
Total other income (expense), net	(5,339)		(49,510)	(76,942)
Loss from continuing operations before income taxes	(7,116)		(12,840)	(134,279)
Income tax provision (benefit)	0		6	0
Loss from continuing operations	(7,116)		(12,846)	(134,279)
Loss from discontinued operations, net of tax	(7,746)		(64,815)	(33,642)
Net loss	(14,862)		(77,661)	(167,921)
Predecessor | Oil
Revenue
Operating revenue	30,972		194,423	105,811
Predecessor | Natural gas
Revenue
Operating revenue	4,276		37,794	20,021
Predecessor | Natural gas liquids
Revenue
Operating revenue	4,000		31,445	14,174
Predecessor | Other
Revenue
Operating revenue	$ 888		$ 5,724	$ 2,350