Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Oil and gas sales	$ 74,703	$ 51,347	$ 146,768	$ 104,099
Costs and Expenses [Abstract]
General and administrative, net	6,624	5,794	12,900	11,370
Depreciation, depletion, and amortization	24,029	13,096	45,834	26,228
Accretion of asset retirement obligation	86	84	168	243
Lease operating costs	5,035	3,760	9,567	8,721
Workovers	(127)	0	519	0
Transportation and gas processing	6,728	5,421	13,135	10,446
Severance and other taxes	3,950	2,662	7,266	5,692
Operating Expenses	46,325	30,817	89,389	62,700
Operating Income (Loss)	28,378	20,530	57,379	41,399
Net gain (loss) on commodity derivatives	24,925	(10,752)	20,903	(17,107)
Interest expense, net	(9,306)	(6,585)	(18,065)	(12,474)
Other Nonoperating Income (Expense)	(28)	(546)	37	(703)
Income (Loss) Before Income Taxes	43,969	2,647	60,254	11,115
Provision (Benefit) for Income Taxes	(20,735)	328	(20,503)	328
Net Income (Loss)	$ 64,704	$ 2,319	$ 80,757	$ 10,787
Per Share Amounts-
Earnings Per Share, Basic	$ 5.51	$ 0.20	$ 6.89	$ 0.93
Earnings Per Share, Diluted	$ 5.49	$ 0.20	$ 6.85	$ 0.92
Weighted Average Shares Outstanding - Basic	11,746	11,655	11,727	11,629
Weighted Average Shares Outstanding - Diluted	11,780	11,757	11,786	11,742