UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues:
Total revenues	$ 80,393	$ 35,171	$ 152,862	$ 93,307
Costs and expenses:
Lease operating expense	28,653	27,828	57,559	63,551
Taxes other than income	5,071	2,195	9,684	6,181
Depreciation, depletion and amortization	7,389	7,623	14,736	23,179
Impairment expense	0	0	0	455,031
General and administrative expense	6,030	6,755	12,951	15,108
Accretion of asset retirement obligations	1,638	1,539	3,253	3,052
(Gain) loss on commodity derivative instruments	63,898	19,165	98,486	(88,548)
Other, net	12	3	96	19
Total costs and expenses	117,741	69,797	206,394	487,315
Operating income (loss)	(37,348)	(34,626)	(53,532)	(394,008)
Other income (expense):
Interest expense, net	(3,137)	(6,209)	(6,249)	(13,856)
Other expense	(54)	(250)	(80)	(234)
Gain on extinguishment of debt	5,516	0	5,516	0
Total other income (expense)	2,325	(6,459)	(813)	(14,090)
Loss before reorganization items, net and income taxes	(35,023)	(41,085)	(54,345)	(408,098)
Reorganization items, net	0	(166)	(6)	(352)
Income tax expense	0	(85)	0	(85)
Net loss	$ (35,023)	$ (41,336)	$ (54,351)	$ (408,535)
Earnings (loss) per share: (See Note 9)
Basic and diluted loss per share	$ (0.92)	$ (1.10)	$ (1.43)	$ (10.87)
Weighted average common shares outstanding:
Basic and diluted	37,983	37,595	37,907	37,582
Oil and Natural Gas Sales [Member]
Revenues:
Total revenues	$ 80,338	$ 34,888	$ 152,669	$ 92,675
Other Revenues [Member]
Revenues:
Total revenues	55	283	193	632
Gathering, Processing and Transportation [Member]
Costs and expenses:
Gathering, processing and transportation	$ 5,050	$ 4,689	$ 9,629	$ 9,742