Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Oil and gas sales	$ 72,064	$ 52,752
Costs and Expenses [Abstract]
General and administrative, net	6,276	5,576
Depreciation, depletion, and amortization	21,805	13,131
Accretion of asset retirement obligation	83	159
Lease operating costs	4,531	4,961
Workovers	646	0
Transportation and gas processing	6,406	5,025
Severance and other taxes	3,316	3,031
Operating Expenses	43,063	31,883
Operating Income (Loss)	29,001	20,869
Net gain (loss) on commodity derivatives	(4,022)	(6,355)
Interest expense, net	(8,759)	(5,890)
Other Nonoperating Income (Expense)	65	(158)
Income (Loss) Before Income Taxes	16,285	8,466
Provision (Benefit) for Income Taxes	232	0
Net Income (Loss)	$ 16,053	$ 8,466
Per Share Amounts-
Earnings Per Share, Basic	$ 1.37	$ 0.73
Earnings Per Share, Diluted	$ 1.36	$ 0.72
Weighted Average Shares Outstanding - Basic	11,708	11,602
Weighted Average Shares Outstanding - Diluted	11,788	11,727