CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	2 Months Ended	3 Months Ended		4 Months Ended	6 Months Ended
	Feb. 28, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Operating revenue:
Oil production		$ 61,688		$ 81,715
Natural gas production		6,540		8,750
Natural gas liquids production		3,014		3,791
Other operational income		27		176
Derivative income, net		5,453		8,099
Total operating revenue		76,722		102,531
Operating expenses:
Lease operating expenses		16,636		21,376
Transportation, processing and gathering expenses		1,825		1,969
Production taxes		193		258
Depreciation, depletion and amortization		33,153		49,000
Write-down of oil and gas properties		0		256,435
Accretion expense		8,702		11,603
Salaries, general and administrative expenses		(18,509)		(21,831)
Incentive compensation expense		0		0
Restructuring fees		322		610
Other operational expenses		(1,928)		(2,589)
Derivative expense, net		0		0
Total operating expenses		81,268		365,671
Gain on Appalachia Properties divestiture		27		27
Loss from operations		(4,519)		(263,113)
Other (income) expenses:
Interest expense		3,601		4,791
Interest income		(169)		(209)
Other income		(312)		(443)
Other expense		814		814
Reorganization items, net				0
Total other expense		3,934		4,953
Loss before income taxes		(8,453)		(268,066)
Provision (benefit) for income taxes:
Current		(1,992)		(1,992)
Deferred		0		0
Total income taxes		(1,992)		(1,992)
Net loss		$ (6,461)		$ (266,074)
Basic income (loss) per share (in usd per share)		$ (0.32)		$ (13.31)
Diluted income (loss) per share (in usd per share)		$ (0.32)		$ (13.31)
Average shares outstanding (in shares)		19,997		19,997
Average shares outstanding assuming dilution (in shares)		19,997		19,997
Predecessor
Operating revenue:
Oil production	$ 45,837		$ 72,711		$ 132,986
Natural gas production	13,476		12,553		27,726
Natural gas liquids production	8,706		3,718		8,453
Other operational income	903		337		693
Derivative income, net	0		0		0
Total operating revenue	68,922		89,319		169,858
Operating expenses:
Lease operating expenses	8,820		18,826		38,373
Transportation, processing and gathering expenses	6,933		7,183		8,024
Production taxes	682		578		1,059
Depreciation, depletion and amortization	37,429		46,231		107,789
Write-down of oil and gas properties	0		118,649		247,853
Accretion expense	5,447		10,082		20,065
Salaries, general and administrative expenses	(9,629)		(20,014)		(32,768)
Incentive compensation expense	2,008		4,670		9,649
Restructuring fees	0		9,436		10,389
Other operational expenses	(530)		(27,680)		(40,207)
Derivative expense, net	1,778		626		488
Total operating expenses	73,256		263,975		516,664
Gain on Appalachia Properties divestiture	213,453		0		0
Loss from operations	209,119		(174,656)		(346,806)
Other (income) expenses:
Interest expense	0		17,599		32,840
Interest income	(45)		(302)		(416)
Other income	(315)		(270)		(568)
Other expense	13,336		9		11
Reorganization items, net	(437,744)				0
Total other expense	(424,768)		17,036		31,867
Loss before income taxes	633,887		(191,692)		(378,673)
Provision (benefit) for income taxes:
Current	3,570		(2,113)		(3,187)
Deferred	0		6,182		9,059
Total income taxes	3,570		4,069		5,872
Net loss	$ 630,317		$ (195,761)		$ (384,545)
Basic income (loss) per share (in usd per share)	$ 110.99		$ (35.05)		$ (68.94)
Diluted income (loss) per share (in usd per share)	$ 110.99		$ (35.05)		$ (68.94)
Average shares outstanding (in shares)	5,634		5,585		5,578
Average shares outstanding assuming dilution (in shares)	5,634		5,585		5,578