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INVESTMENT IN NUSTAR ENERGY Narrative 2 (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Apr. 18, 2017
Schedule of Equity Method Investments [Line Items]            
Contribution to NuStar Energy to maintain general partner interest       $ 13,597 $ 161  
General partner interest percentage       2.00%    
Proceeds from short-term debt borrowings       $ 15,500 4,000  
Common limited partner ownership interest in NuStar Energy   11.00%        
Gain from issuance   $ 41,603 $ 0 41,603 $ 613  
NuStar Energy Common Unit Issuance [Member]            
Schedule of Equity Method Investments [Line Items]            
Limited partner units issued by NuStar Energy   14,375,000        
Price of common units issued by NuStar Energy, per unit           $ 46.35
Net proceeds received by NuStar Energy from issuance of units   $ 657,500        
Contribution to NuStar Energy to maintain general partner interest   13,600        
Gain from issuance   $ 41,600   $ 41,600    
Revolving Credit Facility [Member]            
Schedule of Equity Method Investments [Line Items]            
Proceeds from short-term debt borrowings $ 14,000