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INVESTMENT IN NUSTAR ENERGY Narrative 2 (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Subsidiary, Sale of Stock [Line Items]      
Investment in NuStar Energy L.P. $ 842 $ 7,444 $ 19,340
General partner interest percentage 2.00%    
NuStar Energy Secondary Offerings 2016 [Member]      
Subsidiary, Sale of Stock [Line Items]      
Common limited partner units issued by NuStar Energy 595,050    
Price of common limited partner units issued by NuStar Energy, per unit $ 47.39    
Proceeds received by NuStarEnergy, net of issuance cost, from issuance of NuStar Energy common limited partner units $ 28,300    
Investment in NuStar Energy L.P. $ 600    
General partner interest percentage 2.00%    
Gain related to NuStar Energy L.P.'s issuance of common limited partner units $ 2,100