Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands		3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 18, 2020	Sep. 30, 2019	Sep. 18, 2020	Sep. 30, 2019
Revenues and other income	$ 23,533,000	$ 170,036,000	$ 315,453,000	$ 530,112,000	$ 964,270,000
Expenses
Taxes other than income	2,073,000	13,473,000	22,010,000	43,531,000	71,312,000
General and administrative expenses	1,735,000	15,013,000	18,266,000	48,522,000	54,697,000
Interest, net of amounts capitalized	334,000	7,704,000	22,858,000	48,267,000	60,672,000
Depletion, depreciation, and amortization	5,283,000	36,317,000	55,064,000	188,593,000	170,625,000
Commodity derivatives expense (income)	(4,035,000)	4,609,000	(43,155,000)	(102,032,000)	15,462,000
Gain on debt extinguishment	0	0	(5,874,000)	(18,994,000)	(106,220,000)
Write-down of oil and natural gas properties	0	261,677,000	0	996,658,000	0
Reorganization items, net	0	849,980,000	0	849,980,000	0
Other expenses	2,164,000	22,084,000	2,140,000	35,868,000	8,664,000
Total expenses	20,763,000	1,282,963,000	205,541,000	2,378,819,000	678,722,000
Income (loss) before income taxes	2,770,000	(1,112,927,000)	109,912,000	(1,848,707,000)	285,548,000
Income tax provision (benefit)	12,000	(303,807,000)	37,050,000	(416,129,000)	91,668,000
Net income (loss)	$ 2,758,000	$ (809,120,000)	$ 72,862,000	$ (1,432,578,000)	$ 193,880,000
Net income (loss) per common share
Basic	$ 0.06	$ (1.63)	$ 0.16	$ (2.89)	$ 0.43
Diluted	$ 0.06	$ (1.63)	$ 0.14	$ (2.89)	$ 0.41
Weighted average common shares outstanding
Basic	50,000	497,398	455,487	495,560	453,287
Diluted	50,000	497,398	547,205	495,560	490,054
Other income
Revenues and other income	$ 94,000	$ 7,097,000	$ 7,817,000	$ 8,419,000	$ 12,274,000
Transportation and marketing
Operating expenses	1,344,000	8,155,000	10,067,000	27,164,000	32,076,000
Oil, natural gas, and related product sales
Revenues and other income	22,321,000	153,090,000	293,192,000	492,101,000	918,190,000
Operating expenses	11,484,000	59,708,000	117,850,000	250,271,000	361,205,000
CO2
Revenues and other income	967,000	6,517,000	8,976,000	21,049,000	25,532,000
Operating expenses	242,000	955,000	879,000	2,592,000	2,016,000
Oil marketing
Revenues and other income	151,000	3,332,000	5,468,000	8,543,000	8,274,000
Operating expenses	$ 139,000	$ 3,288,000	$ 5,436,000	$ 8,399,000	$ 8,213,000