CONDENSED 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, 2017	Dec. 31, 2015
Other income (expense)
Income tax benefit				$ (4,900)
Successor [Member]
Revenues
Crude oil	$ 33,157			140,886
Natural gas liquids	2,707			10,066
Natural gas	2,790			8,517
Gain (loss) on sales of assets, net	(49)			(36)
Other, net	398			621
Total revenues	39,003			160,054
Operating expenses
Lease operating	5,331			21,784
Gathering, processing and transportation	3,043			10,734
Production and ad valorem taxes	2,498			8,814
General and administrative	5,088			18,262
Exploration	0			0
Depreciation, depletion and amortization	11,652			48,649
Impairments	0			0
Total operating expenses	27,612			108,243
Operating income (loss)	11,391			51,811
Other income (expense)
Interest expense, net of amounts capitalized	(879)			(6,392)
Derivatives	(16,622)			(17,819)
Other, net	814			119
Reorganization Items	0			0
Income (loss) before income taxes	(5,296)			27,719
Income tax benefit	0			4,943
Net income (loss)	(5,296)			32,662
Preferred stock dividends	0			0
Net loss attributable to common shareholders	$ (5,296)			$ 32,662
Net income (loss) per share:
Basic (in dollars per share)	$ (0.35)			$ 2.18
Diluted (in dollars per share)	$ (0.35)			$ 2.17
Weighted average shares outstanding – basic	14,992			14,996
Weighted average shares outstanding – diluted	14,992			15,063
Predecessor [Member]
Revenues
Crude oil		$ 81,377			$ 220,596
Natural gas liquids		6,064			16,905
Natural gas		6,208			25,479
Gain (loss) on sales of assets, net		1,261			41,335
Other, net		(600)			983
Total revenues		94,310			305,298
Operating expenses
Lease operating		15,626			42,428
Gathering, processing and transportation		13,235			23,815
Production and ad valorem taxes		3,490			16,282
General and administrative		38,945			43,328
Exploration		10,288			12,583
Depreciation, depletion and amortization		33,582			334,479
Impairments		0			1,397,424
Total operating expenses		115,166			1,870,339
Operating income (loss)		(20,856)			(1,565,041)
Other income (expense)
Interest expense, net of amounts capitalized		(58,018)			(90,951)
Derivatives		(8,333)			71,247
Other, net		(3,184)			(3,587)
Reorganization Items		1,144,993			0
Income (loss) before income taxes		1,054,602			(1,588,332)
Income tax benefit		0			5,371
Net income (loss)		1,054,602			(1,582,961)
Preferred stock dividends		(5,972)	[1]		(22,789)
Net loss attributable to common shareholders		$ 1,048,630			$ (1,605,750)
Net income (loss) per share:
Basic (in dollars per share)		$ 11.91			$ (21.81)
Diluted (in dollars per share)		$ 8.50			$ (21.81)
Weighted average shares outstanding – basic		88,013			73,639
Weighted average shares outstanding – diluted		124,087			73,639

[1] Preferred stock dividends were excluded from diluted earnings per share for the year ended December 31, 2015, as the assumed conversion of the outstanding preferred stock would have been anti-dilutive.