CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues
Gain (Loss) on Disposition of Property Plant Equipment	$ 18,000	$ 5,000	$ (177,000)
Total revenues	273,268,000	471,216,000	440,832,000
Operating expenses
Lease operating	37,463,000	43,088,000	35,879,000
Cost of Goods and Services Sold	22,050,000	23,197,000	18,626,000
Production and ad valorem taxes	16,619,000	28,057,000	23,547,000
General and administrative	33,789,000	25,484,000	26,064,000
Depreciation, depletion and amortization	140,673,000	174,569,000	127,961,000
Asset Impairment Charges	391,849,000	0	0
Total operating expenses	642,443,000	294,395,000	232,077,000
Operating income (loss)	(369,175,000)	176,821,000	208,755,000
Other income (expense)
Interest expense, net of amounts capitalized	(31,257,000)	(35,811,000)	(26,462,000)
Derivatives	88,422,000	(68,131,000)	37,427,000
Other, net	(850,000)	(153,000)	2,266,000
Reorganization items, net	0	0	3,322,000
Income (loss) before income taxes	(312,860,000)	72,726,000	225,308,000
Income Tax Expense (Benefit)	2,303,000	(2,137,000)	(523,000)
Net Income (Loss) Available to Common Stockholders, Basic	$ (310,557,000)	$ 70,589,000	$ 224,785,000
Net income (loss) per share:
Basic (in dollars per share)	$ (20.46)	$ 4.67	$ 14.93
Diluted (in dollars per share)	$ (20.46)	$ 4.67	$ 14.70
Weighted average shares outstanding – basic	15,176	15,110	15,059
Weighted average shares outstanding – diluted	15,176	15,126	15,292
Oil and Gas, Exploration and Production [Member]
Revenues
Revenue from contract with customer	$ 251,741,000	$ 434,713,000	$ 402,485,000
Oil and Condensate [Member]
Revenues
Revenue from contract with customer	8,948,000	16,589,000	21,073,000
Natural Gas, Production [Member]
Revenues
Revenue from contract with customer	10,103,000	17,733,000	15,972,000
Product and Service, Other [Member]
Revenues
Revenue from contract with customer	$ 2,458,000	$ 2,176,000	$ 1,479,000