Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Oil and gas sales	$ 24,846	$ 74,703	$ 78,222	$ 146,768
Costs and Expenses [Abstract]
General and administrative, net	6,180	6,624	12,093	12,900
Depreciation, depletion, and amortization	13,716	24,029	37,156	45,834
Accretion of asset retirement obligation	88	86	173	168
Lease operating costs	5,000	5,035	10,812	9,567
Workovers	0	(127)	0	519
Transportation and gas processing	4,554	6,728	11,197	13,135
Severance and other taxes	2,037	3,950	5,001	7,266
Write-down of oil and gas properties	260,342	0	355,948	0
Operating Expenses	291,917	46,325	432,380	89,389
Operating Income (Loss)	(267,071)	28,378	(354,158)	57,379
Net gain (loss) on commodity derivatives	(8,458)	24,925	79,829	20,903
Interest expense, net	(8,026)	(9,306)	(16,433)	(18,065)
Other Nonoperating Income (Expense)	(1)	(28)	107	37
Income (Loss) Before Income Taxes	(283,556)	43,969	(290,655)	60,254
Provision (Benefit) for Income Taxes	22,420	(20,735)	21,179	(20,503)
Net Income (Loss)	$ (305,976)	$ 64,704	$ (311,834)	$ 80,757
Per Share Amounts-
Earnings Per Share, Basic	$ (25.69)	$ 5.51	$ (26.28)	$ 6.89
Earnings Per Share, Diluted	$ (25.69)	$ 5.49	$ (26.28)	$ 6.85
Weighted Average Shares Outstanding - Basic	11,910	11,746	11,868	11,727
Weighted Average Shares Outstanding - Diluted	11,910	11,780	11,868	11,786