UNAUDITED CONDENSED STATEMENTS OF CONSOLIDATED OPERATIONS - USD ($) shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues:
Total revenues	$ 59,532,000	$ 90,988,000	$ 124,687,000	$ 178,920,000
Costs and expenses:
Lease operating expense	26,292,000	27,500,000	55,202,000	57,070,000
Exploration	6,000	2,988,000	21,000	3,022,000
Taxes other than income	3,464,000	5,535,000	7,873,000	10,572,000
Depreciation, depletion and amortization	12,913,000	13,619,000	24,079,000	26,577,000
General and administrative expense	10,566,000	16,863,000	19,874,000	27,520,000
Accretion of asset retirement obligations	1,332,000	1,429,000	2,643,000	3,147,000
(Gain) loss on commodity derivative instruments	(22,993,000)	35,652,000	9,494,000	46,108,000
(Gain) loss on sale of properties	0	(227,000)	0	2,146,000
Other, net	34,000	(120,000)	177,000	(120,000)
Total costs and expenses	36,005,000	109,214,000	128,411,000	187,617,000
Operating income (loss)	23,527,000	(18,226,000)	(3,724,000)	(8,697,000)
Other income (expense):
Interest expense, net	(4,422,000)	(6,287,000)	(8,511,000)	(12,059,000)
Other income (expense)	0	2,000	0	2,000
Total other income (expense)	(4,422,000)	(6,285,000)	(8,511,000)	(12,057,000)
Income (loss) before reorganization items, net and income taxes	19,105,000	(24,511,000)	(12,235,000)	(20,754,000)
Reorganization items, net	(464,000)	(768,000)	(651,000)	(1,286,000)
Income tax benefit (expense)	0	0	50,000	0
Net income (loss)	18,641,000	(25,279,000)	(12,836,000)	(22,040,000)
Net (income) loss allocated to participating restricted stockholders	(728,000)	0	0	0
Net income (loss) attributable to common stockholders	$ 17,913,000	$ (25,279,000)	$ (12,836,000)	$ (22,040,000)
Earnings per share: (See Note 10)
Basic and diluted earnings per share	$ 0.80	$ (1.01)	$ (0.58)	$ (0.88)
Weighted average common shares outstanding:
Basic and diluted	22,267	25,038	22,223	25,019
Oil and Natural Gas Sales [Member]
Revenues:
Total revenues	$ 59,485,000	$ 90,894,000	$ 124,552,000	$ 178,741,000
Other Revenues [Member]
Revenues:
Total revenues	47,000	94,000	135,000	179,000
Gathering, Processing and Transportation [Member]
Costs and expenses:
Gathering, processing and transportation	$ 4,391,000	$ 5,975,000	$ 9,048,000	$ 11,575,000