SUBSEQUENT EVENTS Narrative 1 (Details) - Subsequent Event [Member]		3 Months Ended
	May 04, 2017 USD ($)	Jun. 30, 2017 USD ($)
Subsequent Event [Line Items]
Incentive distribution waiver		$ 22,000,000.0
Number of periods under incentive distribution waiver		10
Navigator Acquisition [Member]
Subsequent Event [Line Items]
NuStar Energy's purchase price of acquired entity	$ 1,475,000,000
Description of NuStar Energy's Navigator Acquisition	Navigator owns and operates crude oil transportation, pipeline gathering and storage assets located in the Midland Basin of West Texas consisting of: (i) more than 500 miles of crude oil gathering and transportation pipelines with approximately 92,000 barrels per day ship-or-pay volume commitments and deliverability of approximately 412,000 barrels per day; (ii) a pipeline gathering system with more than 200 connected producer tank batteries capable of more than 400,000 barrels per day of pumping capacity covering over 500,000 dedicated acres with fixed fee contracts; and (iii) approximately 1.0 million barrels of crude oil storage capacity with 440,000 barrels contracted to third parties.