CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other income (expense)
Income tax benefit (expense)	$ 0		$ 0
Net income (loss)			49,410
Successor [Member]
Revenues
Crude oil	32,351		62,424
Natural gas liquids	2,043		4,345
Natural gas	1,880		4,223
(Loss) gain on sales of assets, net	(134)		(69)
Other, net	142		345
Total revenues	36,282		71,268
Operating expenses
Lease operating	5,370		10,286
Gathering, processing and transportation	2,555		5,106
Production and ad valorem taxes	2,119		4,098
General and administrative	3,721		7,848
Exploration	0		0
Depreciation, depletion and amortization	11,076		20,886
Total operating expenses	24,841		48,224
Operating income (loss)	11,441		23,044
Other income (expense)
Interest expense	(1,274)		(1,812)
Derivatives	11,061		28,077
Other, net	101		101
Reorganization items, net	0		0
Income (loss) before income taxes	21,329		49,410
Net income (loss)	21,329		49,410
Preferred stock dividends	0		0
Net income (loss) attributable to common shareholders	$ 21,329		$ 49,410
Net income (loss) per share:
Basic (in dollars per share)	$ 1.42		$ 3.30
Diluted (in dollars per share)	$ 1.42		$ 3.27
Weighted average shares outstanding – basic (in shares)	14,992		14,992
Weighted average shares outstanding – diluted (in shares)	15,050		15,097
Predecessor [Member]
Revenues
Crude oil		$ 32,019		$ 57,985
Natural gas liquids		2,431		4,384
Natural gas		1,917		4,319
(Loss) gain on sales of assets, net		910		757
Other, net		(125)		204
Total revenues		37,152		67,649
Operating expenses
Lease operating		5,225		11,417
Gathering, processing and transportation		4,650		8,468
Production and ad valorem taxes		2,163		2,916
General and administrative		14,948		32,050
Exploration		4,320		5,647
Depreciation, depletion and amortization		11,746		25,558
Total operating expenses		43,052		86,056
Operating income (loss)		(5,900)		(18,407)
Other income (expense)
Interest expense		(32,221)		(56,655)
Derivatives		(21,759)		(17,267)
Other, net		(6)		(1,030)
Reorganization items, net		(7,380)		(7,380)
Income (loss) before income taxes		(67,266)		(100,739)
Income tax benefit (expense)		0		0
Net income (loss)		(67,266)		(100,739)
Preferred stock dividends		(2,820)		(5,972)
Net income (loss) attributable to common shareholders		$ (70,086)		$ (106,711)
Net income (loss) per share:
Basic (in dollars per share)		$ (0.79)		$ (1.22)
Diluted (in dollars per share)		$ (0.79)		$ (1.22)
Weighted average shares outstanding – basic (in shares)		89,051		87,496
Weighted average shares outstanding – diluted (in shares)		89,051		87,496