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PARTNERS' EQUITY Table 2 (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net Income Allocation [Abstract]      
Net income (loss) attributable to NuStar Energy L.P. $ 306,720 $ 210,773 $ (273,770)
Less general partner incentive distribution 43,220 43,220 43,220
Net income (loss) after general partner incentive distribution $ 263,500 $ 167,553 $ (316,990)
General partner interest 2.00% 2.00% 2.00%
General partner allocation of net income (loss) after general partner incentive distribution $ 5,270 $ 3,352 $ (6,338)
General partner incentive distribution 43,220 43,220 43,220
Net income applicable to general partner $ 48,490 $ 46,572 $ 36,882