Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018		Sep. 30, 2019	Sep. 30, 2018
Revenues:
Oil and gas sales	$ 15,908	$ 23,825		$ 55,411	$ 72,354
Gain (loss) on hedging activities		458			(1,456)
Total revenue	15,908	24,283		55,411	70,898
Operating expenses:
Production and ad valorem taxes	891	1,326		2,940	3,854
Marketing and transportation	584	493		1,933	1,487
Amortization of royalty interests in oil and natural gas properties	3,184	4,494		9,624	13,179
General, administrative and other	3,168	1,132		8,728	7,013
Total operating expenses	7,827	7,445		23,225	25,533
Operating income	8,081	16,838		32,186	45,365
Other income (expense):
Gain on the sale of assets					41,382
Other income	58	38		134	39
Interest expense	(650)	(557)		(1,838)	(1,600)
Total other income (expense)	(592)	(519)		(1,704)	39,821
Income before income taxes	7,489	16,319		30,482	85,186
Provision for income taxes	1,132	810		3,920	810
Income from continuing operations	6,357	15,509		26,562	84,376
Income from discontinued operations		91			2,139
Net income	6,357	15,600		26,562	86,515
Net income attributable to non-controlling interests	(3,473)	(2,933)		(14,540)	(3,028)
Net income attributable to common shareholders/unitholders	$ 2,884	$ 12,667		$ 12,022	$ 83,487
Earnings per common share:
Common shares (basic and diluted)	$ 0.06	$ 0.06	[1]	$ 0.26	$ 0.06	[1]
Weighted average number of shares outstanding:
Common shares (basic and diluted)	45,899	45,855		45,871	45,855

[1] Subsequent to the issuance of the Company's Quarterly Report on Form 10-Q for the three and nine months ended September 30, 2018, the Company's management determined that net income attributable to non-controlling interests, net of tax, had been excluded from the numerator in the calculation of Earnings per common share (diluted). As a result, Earnings per common share (diluted) for the three months ended September 30, 2018 has been adjusted from $0.03 previously reported to $0.06.