MEMBERS' EQUITY Table 1 (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Changes in Members' Equity [Roll Forward]
Balance as of January 1, 2017	$ 243,788
Net income	16,992	$ 16,676
Distributions to unitholders	(23,408)	$ (23,397)
Share of NuStar Energy’s other comprehensive income	560
Unit-based compensation expense	152
Balance as of March 31, 2017	$ 238,084