DISTRIBUTIONS FROM NUSTAR ENERGY Narrative 1 (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
DISTRIBUTIONS FROM NUSTAR ENERGY [Abstract]
Incentive distribution rights entitlement, minimum per unit	$ 0.60
Incentive distribution rights maximum cash percentage	23.00%
Incentive distribution rights entitlement, maximum per unit	$ 0.66
General partner interest percentage	2.00%	2.00%