Unaudited Condensed Consolidated Statements Of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues
Revenues	$ 17,220	$ 52,215	$ 54,250	$ 92,956
Expenses
Lease operating and gas gathering	4,903	8,929	14,692	16,638
Production and ad valorem taxes	1,721	2,818	4,091	5,109
Depreciation, depletion and amortization	16,575	21,515	40,929	39,486
Loss on sale and disposal of oil and gas properties	1,254	155	1,254	33,046
Impairment of oil and gas properties	0	0	199,908	0
General and administrative	5,981	3,841	8,856	8,221
Other expense (income)	58	0	(139)	(2)
Total expenses	30,492	37,258	269,591	102,498
(Loss) income from operations	(13,272)	14,957	(215,341)	(9,542)
Other (expense) income
Interest expense	(10,512)	(10,778)	(22,122)	(21,434)
Change in fair value of warrants	0	796	363	694
(Loss) gain on derivative financial instruments	(21,141)	9,514	80,029	(26,724)
Total other (expense) income	(31,653)	(468)	58,270	(47,464)
Loss (income) before income taxes	(44,925)	14,489	(157,071)	(57,006)
Income tax benefit (expense)	4,332	(1,200)	5,687	11,732
Net (loss) income	(40,593)	13,289	(151,384)	(45,274)
Preferred stock dividends	(2,308)	(2,112)	(4,566)	(4,177)
Net (loss) income attributable to common stockholders	$ (42,901)	$ 11,177	$ (155,950)	$ (49,451)
Net (loss) income per common share
Basic (in dollars per share)	$ (1.70)	$ 0.28	$ (6.20)	$ (1.99)
Diluted (in dollars per share)	$ (1.70)	$ 0.28	$ (6.20)	$ (1.99)
Weighted average common shares outstanding
Basic (in shares)	25,307,714	24,924,169	25,154,151	24,811,895
Diluted (in shares)	25,307,714	24,924,169	25,154,151	24,811,895
Oil sales
Revenues
Revenues	$ 11,976	$ 44,726	$ 41,986	$ 78,310
Natural gas liquid sales
Revenues
Revenues	1,762	3,549	4,362	6,942
Natural gas sales
Revenues
Revenues	$ 3,482	$ 3,940	$ 7,902	$ 7,704