Consolidated statements of operations - USD ($) $ in Thousands		3 Months Ended	9 Months Ended	12 Months Ended
		Mar. 21, 2017	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Revenues:
Commodity sales		$ 66,531	$ 226,493	$ 233,150	$ 242,569
Sublease revenue				3,195
Sublease revenue		0	586		4,793
Total revenues		66,531	227,079	236,345	247,362
Costs and expenses:
Lease operating		19,941	72,132	49,605	54,219
Transportation and processing		2,034	9,503	0	0
Production taxes		2,417	11,750	13,290	13,150
Depreciation, depletion and amortization		24,915	92,599	109,633	87,888
Impairment of oil and gas assets		0	42,146	430,695	20,065
Impairment of other assets		0	179	7,188	0
General and administrative		6,843	39,617	34,210	38,793
Cost reduction initiatives		629	691	0	1,034
Other		0	3,728	1,075	2,036
Total costs and expenses		56,779	272,345	645,696	217,185
Operating (loss) income		9,752	(45,266)	(409,351)	30,177
Non-operating (expense) income:
Interest expense		(5,862)	(14,147)	(22,666)	(11,383)
Loss on extinguishment of debt		0	(635)	(1,624)	0
Derivative (losses) gains		48,006	(30,802)	(33,198)	19,297
(Loss) gain on sale of assets		206	(25,996)	(6)	(2,582)
Other (loss) income, net		1,167	686	(350)	248
Net non-operating (expense) income		43,517	(70,894)	(57,844)	5,580
Reorganization items, net		988,727	(3,091)	(1,753)	(2,392)
(Loss) income before income taxes		1,041,996	(119,251)	(468,948)	33,365
Income tax (benefit) expense		37	(349)	0	(77)
Net (loss) income		$ 1,041,959	$ (118,902)	$ (468,948)	$ 33,442
Earnings per share:
Basic for Class A and Class B (in dollars per share)	[1]		$ (2.64)	$ (10.28)	$ 0.74
Diluted for Class A and Class B (in dollars per share)	[1]		$ (2.64)	$ (10.28)	$ 0.73
Weighted average shares used to compute earnings per share:
Basic for Class A and Class B (in shares)	[1]		44,984,046	45,637,338	45,288,980
Diluted for Class A and Class B (in shares)	[1]		44,984,046	45,637,338	45,730,171

[1] See “Note 2: Earnings per share.”