CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues
Total revenues	$ 16,655,000	$ 75,388,000	$ 56,984,000	$ 148,624,000
Expenses
Lease operating expenses	8,698,000	25,076,000	24,340,000	47,855,000
Production, ad valorem, and other taxes	1,854,000	5,877,000	5,053,000	10,957,000
Depreciation and depletion — oil and natural gas	13,348,000	39,419,000	38,203,000	75,884,000
Depreciation and amortization — other	1,739,000	2,986,000	4,373,000	5,929,000
Impairment	201,784,000	0	209,754,000	0
General and administrative	4,314,000	10,084,000	9,797,000	20,023,000
Restructuring expenses	444,000	0	444,000	0
Employee termination benefits	1,993,000	4,465,000	5,247,000	4,465,000
(Gain) loss on derivative contracts	(2,241,000)	0	(12,467,000)	209,000
Loss (gains) on sale of assets			78,000	0
Other operating expense	108,000	37,000	385,000	119,000
Total expenses	232,041,000	87,944,000	285,129,000	165,441,000
Loss from operations	(215,386,000)	(12,556,000)	(228,145,000)	(16,817,000)
Other income (expense)
Interest expense, net	(447,000)	(702,000)	(1,084,000)	(1,287,000)
Other income (expense), net	58,000	(26,000)	134,000	(457,000)
Total other expense	(389,000)	(728,000)	(950,000)	(1,744,000)
Loss before income taxes	(215,775,000)	(13,284,000)	(229,095,000)	(18,561,000)
Income tax expense (benefit)	4,000	0	(646,000)	0
Net loss	$ (215,779,000)	$ (13,284,000)	$ (228,449,000)	$ (18,561,000)
Loss per share
Basic (in dollars per share)	$ (6.06)	$ (0.38)	$ (6.42)	$ (0.53)
Diluted (in dollars per share)	$ (6.06)	$ (0.38)	$ (6.42)	$ (0.53)
Weighted average number of common shares outstanding
Basic (in shares)	35,611	35,356	35,581	35,339
Diluted (in shares)	35,611	35,356	35,581	35,339
Oil, natural gas and NGL
Revenues
Total revenues	$ 16,448,000	$ 75,196,000	$ 56,587,000	$ 148,244,000
Other
Revenues
Total revenues	$ 207,000	$ 192,000	$ 397,000	$ 380,000