CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Equity in earnings (loss) of NuStar Energy L.P.	$ 13,462	$ 9,185	$ 39,023	$ (11,471)
General and administrative expenses	(941)	(654)	(2,359)	(2,306)
Other income (expense), net	(9)	10,702	90	10,808
Interest expense, net	(191)	(158)	(534)	(442)
Income (loss) before income tax (expense) benefit	12,321	19,075	36,220	(3,411)
Income tax (expense) benefit	(286)	90	(551)	414
Net income (loss)	12,035	19,165	35,669	(2,997)
Comprehensive income (loss)	$ 14,501	$ 19,225	$ 38,421	$ (9,442)
Basic net income (loss) per unit	$ 0.29	$ 0.45	$ 0.84	$ (0.07)
Diluted net income (loss) per unit	$ 0.29	$ 0.45	$ 0.84	$ (0.07)
Weighted-average number of basic units outstanding	42,624,518	42,575,563	42,616,256	42,575,183
Weighted-average number of diluted units outstanding	42,624,518	42,575,563	42,616,256	42,575,183