CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues
Gain on sales of assets, net	$ 2	$ 9	$ 81	$ (60)
Total revenues	127,185	34,459	315,976	105,727
Operating expenses
Lease operating	9,898	5,254	25,924	15,540
Gathering, processing and transportation	4,928	2,399	12,861	7,505
Production and ad valorem taxes	7,152	1,668	17,039	5,766
General and administrative	6,155	6,932	17,948	14,741
Depreciation, depletion and amortization	35,016	10,659	88,370	31,545
Total operating expenses	63,149	26,912	162,142	75,097
Operating income (loss)	64,036	7,547	153,834	30,630
Other income (expense)
Interest expense	(7,322)	(1,202)	(18,073)	(3,014)
Derivatives	(40,689)	(12,275)	(111,725)	15,802
Other, net	241	(17)	167	45
Income (loss) before income taxes	16,266	(5,947)	24,203	43,463
Income tax benefit (expense)	10	0	(153)	0
Net income (loss) attributable to common shareholders	$ 16,276	$ (5,947)	$ 24,050	$ 43,463
Net income (loss) per share:
Basic (in dollars per share)	$ 1.08	$ (0.40)	$ 1.60	$ 2.90
Diluted (in dollars per share)	$ 1.06	$ (0.40)	$ 1.57	$ 2.89
Weighted average shares outstanding – basic (in shares)	15,062	14,994	15,054	14,993
Weighted average shares outstanding – diluted (in shares)	15,344	14,994	15,278	15,062
Oil and Gas, Exploration and Production [Member]
Revenues
Revenues	$ 117,059	$ 29,963	$ 290,033	$ 92,387
Oil and Condensate [Member]
Revenues
Revenues	5,976	2,393	14,455	6,738
Natural Gas, Production [Member]
Revenues
Revenues	3,768	1,977	10,470	6,200
Product and Service, Other [Member]
Revenues
Revenues	$ 380	$ 117	$ 937	$ 462