CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues
Crude oil	$ 71,258	$ 30,073
Natural gas liquids	2,946	2,302
Natural gas	2,790	2,343
Gain on sales of assets, net	75	65
Other, net	142	203
Total revenues	77,211	34,986
Operating expenses
Lease operating	7,296	4,916
Gathering, processing and transportation	3,359	2,551
Production and ad valorem taxes	4,092	1,979
General and administrative	6,471	4,107
Depreciation, depletion and amortization	22,081	9,810
Total operating expenses	43,299	23,363
Operating income (loss)	33,912	11,623
Other income (expense)
Interest expense	(4,601)	(538)
Derivatives	(18,795)	17,016
Other, net	(58)	(20)
Income (loss) before income taxes	10,458	28,081
Income tax benefit (expense)	(163)	0
Net income (loss)	10,295	28,081
Net income (loss) attributable to common shareholders	$ 10,295	$ 28,081
Net income (loss) per share:
Basic (in dollars per share)	$ 0.68	$ 1.87
Diluted (in dollars per share)	$ 0.68	$ 1.86
Weighted average shares outstanding – basic (in shares)	15,042	14,992
Weighted average shares outstanding – diluted (in shares)	15,081	15,126