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NET INCOME PER UNIT Narrative (Details)	3 Months Ended	6 Months Ended
NET INCOME PER UNIT Narrative (Details)	Jun. 30, 2013	Jun. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding options to purchase NuStar GP Holdings units	289,100	289,100

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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