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PARTNERS' EQUITY Table 2 (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Net Income Allocation [Line Items]      
Net income attributable to NuStar Energy L.P. $ 221,461 $ 238,970 $ 224,875
Less general partner incentive distribution (a) 36,319 33,304 28,712
Net income after general partner incentive distribution 185,142 205,666 196,163
General partner interest 2.00% 2.00% 2.00%
General partner allocation of net income after general partner incentive distribution 3,703 4,113 3,924
General partner incentive distribution 36,319 33,304 28,712
Net income applicable to general partner $ 40,022 $ 37,417 $ 32,636