CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Equity in earnings (loss) of NuStar Energy L.P.	$ 13,417	$ (32,428)	$ 25,561	$ (20,656)
General and administrative expenses	(618)	(795)	(1,418)	(1,652)
Other income (expense), net	18	(30)	99	106
Interest expense, net	(170)	(151)	(343)	(284)
Income (loss) before income tax (expense) benefit	12,647	(33,404)	23,899	(22,486)
Income tax (expense) benefit	(88)	196	(265)	324
Net income (loss)	12,559	(33,208)	23,634	(22,162)
Comprehensive income (loss)	$ 12,648	$ (33,953)	$ 23,920	$ (28,667)
Basic net income (loss) per unit	$ 0.29	$ (0.78)	$ 0.55	$ (0.52)
Diluted net income (loss) per unit	$ 0.29	$ (0.78)	$ 0.55	$ (0.52)
Weighted-average number of basic units outstanding	42,618,376	42,575,563	42,612,057	42,574,991
Weighted-average number of diluted units outstanding	42,618,376	42,575,563	42,612,057	42,574,991