CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues
Total revenues	$ 27,676	$ 58,369	$ 84,660	$ 206,993
Expenses
Lease operating expenses	8,069	23,866	32,409	71,721
Production, ad valorem, and other taxes	2,333	4,346	7,386	15,303
Depreciation and depletion — oil and natural gas	7,525	38,871	45,728	114,755
Depreciation and amortization — other	1,698	2,981	6,071	8,910
Impairment	44,043	165,507	253,797	165,507
General and administrative	2,493	6,238	12,290	26,261
Restructuring expenses	1,199	0	1,643	0
Employee termination benefits	3,184	0	8,431	4,465
(Gain) loss on derivative contracts	5,299	(1,756)	(7,168)	(1,547)
Other operating expense, net	(116)	23	269	142
Total expenses	75,727	240,076	360,856	405,517
Loss from operations	(48,051)	(181,707)	(276,196)	(198,524)
Other income (expense)
Interest expense, net	(569)	(722)	(1,653)	(2,009)
Other income (expense), net	(129)	827	5	370
Total other income (expense)	(698)	105	(1,648)	(1,639)
Loss before income taxes	(48,749)	(181,602)	(277,844)	(200,163)
Income tax expense (benefit)	0	0	(646)	0
Net loss	$ (48,749)	$ (181,602)	$ (277,198)	$ (200,163)
Loss per share
Basic (in dollars per share)	$ (1.36)	$ (5.12)	$ (7.78)	$ (5.66)
Diluted (in dollars per share)	$ (1.36)	$ (5.12)	$ (7.78)	$ (5.66)
Weighted average number of common shares outstanding
Basic (in shares)	35,783,000	35,491,000	35,649,000	35,390,000
Diluted (in shares)	35,783,000	35,491,000	35,649,000	35,390,000
Oil, natural gas and NGL
Revenues
Total revenues	$ 27,547	$ 58,188	$ 84,134	$ 206,432
Other
Revenues
Total revenues	$ 129	$ 181	$ 526	$ 561