CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues
Total revenues	$ 33,623	$ 40,329
Expenses
Lease operating expenses	7,954	15,642
Production, ad valorem, and other taxes	2,176	3,199
Depreciation and depletion — oil and natural gas	2,505	24,855
Depreciation and amortization — other	1,494	2,634
Impairment	0	7,970
General and administrative	2,090	5,483
Restructuring expenses	2,054	0
Employee termination benefits	49	3,254
(Gain) loss on derivative contracts	0	(10,226)
(Gain) loss on sale of assets	(19,713)	0
Other operating (income) expense, net	(48)	277
Total expenses	(1,439)	53,088
Income (loss) from operations	35,062	(12,759)
Other income (expense)
Interest expense, net	(47)	(637)
Other income (expense), net	28	76
Total other income (expense)	(19)	(561)
Income (loss) before income taxes	35,043	(13,320)
Income tax expense (benefit)	0	(650)
Net income (loss)	$ 35,043	$ (12,670)
Net income (loss) per share
Basic (in dollars per share)	$ 0.97	$ (0.36)
Diluted (in dollars per share)	$ 0.94	$ (0.36)
Weighted average number of common shares outstanding
Basic (in shares)	36,156	35,551
Diluted (in shares)	37,439	35,551
Oil, natural gas and NGL
Revenues
Total revenues	$ 33,623	$ 40,139
Other
Revenues
Total revenues	$ 0	$ 190