CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2016	Sep. 12, 2016	Dec. 31, 2018	Dec. 31, 2017
Other income (expense)
Income tax (expense) benefit			$ (4,900)
Successor [Member]
Revenues
Gain (loss) on sales of assets, net	$ (49)		(177)	$ (36)
Total revenues	39,003		440,832	160,054
Operating expenses
Lease operating	5,331		35,879	21,784
Cost of Goods and Services Sold	3,043		18,626	10,734
Production and ad valorem taxes	2,498		23,547	8,814
General and administrative	5,066		26,064	18,201
Exploration	0		0	0
Depreciation, depletion and amortization	11,652		127,961	48,649
Total operating expenses	27,590		232,077	108,182
Operating income (loss)	11,413		208,755	51,872
Other income (expense)
Interest expense, net of amounts capitalized	(879)		(26,462)	(6,392)
Derivatives	(16,622)		37,427	(17,819)
Other, net	792		2,266	58
Reorganization items, net	0		3,322	0
Income (loss) before income taxes	(5,296)		225,308	27,719
Income tax (expense) benefit	0		(523)	4,943
Net income (loss)	(5,296)		224,785	32,662
Preferred stock dividends	0		0	0
Net loss attributable to common shareholders	$ (5,296)		$ 224,785	$ 32,662
Net income (loss) per share:
Basic (in dollars per share)	$ (0.35)		$ 14.93	$ 2.18
Diluted (in dollars per share)	$ (0.35)		$ 14.70	$ 2.17
Weighted average shares outstanding – basic	14,992		15,059	14,996
Weighted average shares outstanding – diluted	14,992		15,292	15,063
Predecessor [Member]
Revenues
Gain (loss) on sales of assets, net		$ 1,261
Total revenues		94,310
Operating expenses
Lease operating		15,626
Cost of Goods and Services Sold		13,235
Production and ad valorem taxes		3,490
General and administrative		38,956
Exploration		10,288
Depreciation, depletion and amortization		33,582
Total operating expenses		115,177
Operating income (loss)		(20,867)
Other income (expense)
Interest expense, net of amounts capitalized		(58,018)
Derivatives		(8,333)
Other, net		(3,173)
Reorganization items, net		1,144,993
Income (loss) before income taxes		1,054,602
Income tax (expense) benefit		0
Net income (loss)		1,054,602
Preferred stock dividends		(5,972)
Net loss attributable to common shareholders		$ 1,048,630
Net income (loss) per share:
Basic (in dollars per share)		$ 11.91
Diluted (in dollars per share)		$ 8.50
Weighted average shares outstanding – basic		88,013
Weighted average shares outstanding – diluted		124,087
Oil and Gas, Exploration and Production [Member] | Successor [Member]
Revenues
Revenue from contract with customer	$ 33,157		$ 402,485	$ 140,886
Oil and Gas, Exploration and Production [Member] | Predecessor [Member]
Revenues
Revenue from contract with customer		$ 81,377
Oil and Condensate [Member] | Successor [Member]
Revenues
Revenue from contract with customer	2,707		21,073	10,066
Oil and Condensate [Member] | Predecessor [Member]
Revenues
Revenue from contract with customer		6,064
Natural Gas, Production [Member] | Successor [Member]
Revenues
Revenue from contract with customer	2,790		15,972	8,517
Natural Gas, Production [Member] | Predecessor [Member]
Revenues
Revenue from contract with customer		6,208
Product and Service, Other [Member] | Successor [Member]
Revenues
Revenue from contract with customer	$ 398		$ 1,479	$ 621
Product and Service, Other [Member] | Predecessor [Member]
Revenues
Revenue from contract with customer		$ 600