Unaudited Condensed Consolidated Statements Of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues
Revenues	$ 32,109	$ 53,145	$ 86,360	$ 146,101
Expenses
Lease operating	4,763	8,948	16,430	23,472
Production and ad valorem taxes	1,994	3,017	6,084	8,126
Depreciation, depletion and amortization	18,256	24,635	59,184	64,120
Loss on sale and disposal of oil and gas properties	0	483	1,254	33,530
Impairment of oil and gas properties	0	0	199,908	0
General and administrative	15,808	4,124	24,664	12,345
Other expense (income)	121	(2)	(15)	(4)
Total expenses	42,833	42,312	312,425	144,812
(Loss) income from operations	(10,724)	10,833	(226,065)	1,289
Other (expense) income
Interest expense	(11,399)	(11,295)	(33,521)	(32,730)
Change in fair value of warrants	0	(100)	363	594
(Loss) gain on derivative financial instruments	(9,656)	21,546	70,373	(5,177)
Reorganization items, net	(3,072)	0	(3,072)	0
Total other (expense) income	(24,127)	10,151	34,143	(37,313)
(Loss) income before income taxes	(34,851)	20,984	(191,922)	(36,024)
Income tax benefit (expense)	49	(4,767)	5,736	6,966
Net (loss) income	(34,802)	16,217	(186,186)	(29,058)
Preferred stock dividends	0	(2,159)	(4,566)	(6,336)
Undeclared cumulative preferred stock dividends	(3,671)	0	(3,671)	0
Total net (loss) income attributable to common stockholders	$ (38,473)	$ 14,058	$ (194,423)	$ (35,394)
Net (loss) income per common share
Basic (in dollars per share)	$ (1.52)	$ 0.34	$ (7.70)	$ (1.42)
Diluted (in dollars per share)	$ (1.52)	$ 0.33	$ (7.70)	$ (1.42)
Weighted average common shares outstanding
Basic (in shares)	25,361,361	24,933,853	25,238,972	24,852,994
Diluted (in shares)	25,361,361	25,331,810	25,238,972	24,852,994
Oil sales
Revenues
Revenues	$ 24,524	$ 42,187	$ 66,510	$ 120,496
Natural gas liquid sales
Revenues
Revenues	3,202	3,439	7,565	10,381
Natural gas sales
Revenues
Revenues	4,383	7,519	12,285	15,224
Gas gathering, processing and transportation
Expenses
Gas gathering, processing and transportation	$ 1,891	$ 1,107	$ 4,916	$ 3,223