Consolidated statements of operations - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 21, 2017	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2016
Revenues:
Commodity sales		$ 226,493	$ 242,569
Sublease revenue		586	4,793
Total revenues		227,079	247,362
Costs and expenses:
Lease operating		72,132	54,219
Transportation and processing		9,503	0
Production taxes		11,750	13,150
Depreciation, depletion and amortization		92,599	87,888
Loss on impairment of oil and gas assets		42,146	20,065
Loss on impairment of other assets		179	0
General and administrative		39,617	38,793
Liability management		0	0
Cost reduction initiatives		691	1,034
Other		3,728	2,036
Total costs and expenses		272,345	217,185
Operating income (loss)		(45,266)	30,177
Non-operating (expense) income:
Interest expense		(14,147)	(11,383)
Loss on extinguishment of debt		(635)	0
Non-hedge derivative gains (losses)		(30,802)	19,297
Write-off of Senior Note issuance costs, discount and premium		0	0
(Loss) gain on sale of assets		(25,996)	(2,582)
Other income, net		686	248
Net non-operating (expense) income		(70,894)	5,580
Reorganization items, net		(3,091)	(2,392)
Income (loss) before income taxes		(119,251)	33,365
Income tax (benefit) expense		(349)	(77)
Net income (loss)		$ (118,902)	$ 33,442
Earnings per share:
Basic for Class A and Class B (in dollars per share)		$ (2.64)	$ 0.74
Diluted for Class A and Class B (in dollars per share)		$ (2.64)	$ 0.73
Weighted average shares used to compute earnings per share:
Basic for Class A and Class B (in shares)		44,984,046	45,288,980
Diluted for Class A and Class B (in shares)		44,984,046	45,730,171
Predecessor
Revenues:
Commodity sales	$ 66,531			$ 252,152
Sublease revenue	0			0
Total revenues	66,531			252,152
Costs and expenses:
Lease operating	19,941			90,533
Transportation and processing	2,034			8,845
Production taxes	2,417			9,610
Depreciation, depletion and amortization	24,915			122,928
Loss on impairment of oil and gas assets	0			281,079
Loss on impairment of other assets	0			1,393
General and administrative	6,843			20,953
Liability management	0			9,396
Cost reduction initiatives	629			2,879
Other	0			0
Total costs and expenses	56,779			547,616
Operating income (loss)	9,752			(295,464)
Non-operating (expense) income:
Interest expense	(5,862)			(64,242)
Loss on extinguishment of debt	0			0
Non-hedge derivative gains (losses)	48,006			(22,837)
Write-off of Senior Note issuance costs, discount and premium	0			(16,970)
(Loss) gain on sale of assets	206			(117)
Other income, net	1,167			528
Net non-operating (expense) income	43,517			(103,638)
Reorganization items, net	988,727			(16,720)
Income (loss) before income taxes	1,041,996			(415,822)
Income tax (benefit) expense	37			(102)
Net income (loss)	$ 1,041,959			$ (415,720)