CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Equity in earnings of NuStar Energy L.P.	$ 17,015	$ 27,522
General and administrative expenses	(832)	(951)
Other income, net	613	462
Interest expense, net	(246)	(213)
Income before income tax benefit (expense)	16,550	26,820
Income tax benefit (expense)	126	(15)
Net income	16,676	26,805
Comprehensive income	$ 9,958	$ 23,540
Basic net income per unit	$ 0.39	$ 0.62
Diluted net income per unit	$ 0.39	$ 0.62
Weighted-average number of basic units outstanding	42,930,549	42,913,277
Weighted-average number of diluted units outstanding	42,930,549	42,913,277