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CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Table 1 - Condensed Consolidating Balance Sheets (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Assets        
Cash and cash equivalents $ 20,344 $ 24,292 $ 29,191 $ 35,942
Receivables, net 142,151 176,775    
Inventories 28,071 26,857    
Other current assets 26,526 22,508    
Intercompany receivable 0 0    
Total current assets 217,092 250,432    
Property, plant and equipment, net 4,459,681 4,300,933    
Intangible assets, net 758,767 784,479    
Goodwill 1,094,661 1,097,475    
Investment in wholly owned subsidiaries 0 0    
Deferred income tax asset 0 233    
Other long-term assets, net 116,768 101,681    
Total assets 6,646,969 6,535,233    
Liabilities, Mezzanine Equity and Partners’ Equity        
Accounts payable 127,801 145,932    
Short-term debt 63,000 35,000    
Current portion of long-term debt 0 349,990    
Accrued interest payable 36,192 40,449    
Accrued liabilities 64,719 61,578    
Taxes other than income tax 16,220 14,385    
Income tax payable 3,357 4,172    
Intercompany payable 0 0    
Total current liabilities 311,289 651,506    
Long-term debt, less current portion 3,380,366 3,263,069    
Deferred income tax liability 23,113 22,272    
Other long-term liabilities 105,013 118,297    
Series D preferred units 370,711 0    
Total partners' equity 2,456,477 2,480,089    
Total liabilities, mezzanine equity and partners’ equity 6,646,969 6,535,233    
Eliminations [Member]        
Assets        
Cash and cash equivalents 0 0 0 0
Receivables, net 0 0    
Inventories 0 0    
Other current assets 0 0    
Intercompany receivable (2,882,812) (3,112,164)    
Total current assets (2,882,812) (3,112,164)    
Property, plant and equipment, net 0 0    
Intangible assets, net 0 0    
Goodwill 0 0    
Investment in wholly owned subsidiaries (5,155,712) (5,008,132)    
Deferred income tax asset   0    
Other long-term assets, net 0 0    
Total assets (8,038,524) (8,120,296)    
Liabilities, Mezzanine Equity and Partners’ Equity        
Accounts payable 0 0    
Short-term debt 0 0    
Current portion of long-term debt   0    
Accrued interest payable 0 0    
Accrued liabilities 0 0    
Taxes other than income tax 0 0    
Income tax payable 0 0    
Intercompany payable (2,882,812) (3,112,164)    
Total current liabilities (2,882,812) (3,112,164)    
Long-term debt, less current portion 0 0    
Deferred income tax liability 0 0    
Other long-term liabilities 0 0    
Series D preferred units 0      
Total partners' equity (5,155,712) (5,008,132)    
Total liabilities, mezzanine equity and partners’ equity (8,038,524) (8,120,296)    
Parent Company Guarantor [Member] | NuStar Energy | Reportable Legal Entities [Member]        
Assets        
Cash and cash equivalents 896 885 867 870
Receivables, net 204 0    
Inventories 0 0    
Other current assets 78 61    
Intercompany receivable 56,954 0    
Total current assets 58,132 946    
Property, plant and equipment, net 0 0    
Intangible assets, net 0 0    
Goodwill 0 0    
Investment in wholly owned subsidiaries 2,837,072 2,891,371    
Deferred income tax asset   0    
Other long-term assets, net 3,391 303    
Total assets 2,898,595 2,892,620    
Liabilities, Mezzanine Equity and Partners’ Equity        
Accounts payable 4,169 4,078    
Short-term debt 0 0    
Current portion of long-term debt   0    
Accrued interest payable 0 0    
Accrued liabilities 608 1,105    
Taxes other than income tax 6 125    
Income tax payable 0 0    
Intercompany payable 0 322,296    
Total current liabilities 4,783 327,604    
Long-term debt, less current portion 0 0    
Deferred income tax liability 0 0    
Other long-term liabilities 0 0    
Series D preferred units 370,711      
Total partners' equity 2,523,101 2,565,016    
Total liabilities, mezzanine equity and partners’ equity 2,898,595 2,892,620    
Subsidiary Issuer [Member] | NuStar Logistics | Reportable Legal Entities [Member]        
Assets        
Cash and cash equivalents 1,777 29 64 5
Receivables, net 61 280    
Inventories 1,913 1,686    
Other current assets 16,119 11,412    
Intercompany receivable 2,825,858 3,112,164    
Total current assets 2,845,728 3,125,571    
Property, plant and equipment, net 1,857,862 1,893,720    
Intangible assets, net 53,819 58,530    
Goodwill 149,453 149,453    
Investment in wholly owned subsidiaries 20,557 24,162    
Deferred income tax asset   0    
Other long-term assets, net 73,591 65,684    
Total assets 5,001,010 5,317,120    
Liabilities, Mezzanine Equity and Partners’ Equity        
Accounts payable 25,949 27,642    
Short-term debt 63,000 35,000    
Current portion of long-term debt   349,990    
Accrued interest payable 36,144 40,402    
Accrued liabilities 21,666 17,628    
Taxes other than income tax 5,368 7,110    
Income tax payable 231 732    
Intercompany payable 0 0    
Total current liabilities 152,358 478,504    
Long-term debt, less current portion 3,324,389 3,201,220    
Deferred income tax liability 1,262 1,262    
Other long-term liabilities 44,622 58,806    
Series D preferred units 0      
Total partners' equity 1,478,379 1,577,328    
Total liabilities, mezzanine equity and partners’ equity 5,001,010 5,317,120    
Guarantor Subsidiaries [Member] | NuPOP | Reportable Legal Entities [Member]        
Assets        
Cash and cash equivalents 0 0 0 0
Receivables, net 0 0    
Inventories 8,408 8,611    
Other current assets 1,838 4,191    
Intercompany receivable 0 0    
Total current assets 10,246 12,802    
Property, plant and equipment, net 622,399 591,070    
Intangible assets, net 0 0    
Goodwill 170,652 170,652    
Investment in wholly owned subsidiaries 1,436,981 1,301,717    
Deferred income tax asset   0    
Other long-term assets, net 26,944 27,493    
Total assets 2,267,222 2,103,734    
Liabilities, Mezzanine Equity and Partners’ Equity        
Accounts payable 6,810 13,160    
Short-term debt 0 0    
Current portion of long-term debt   0    
Accrued interest payable 0 0    
Accrued liabilities 8,016 9,450    
Taxes other than income tax 4,828 3,794    
Income tax payable 0 4    
Intercompany payable 1,372,863 1,277,691    
Total current liabilities 1,392,517 1,304,099    
Long-term debt, less current portion 0 0    
Deferred income tax liability 12 12    
Other long-term liabilities 13,793 8,861    
Series D preferred units 0      
Total partners' equity 860,900 790,762    
Total liabilities, mezzanine equity and partners’ equity 2,267,222 2,103,734    
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]        
Assets        
Cash and cash equivalents 17,671 23,378 $ 28,260 $ 35,067
Receivables, net 141,886 176,495    
Inventories 17,750 16,560    
Other current assets 8,491 6,844    
Intercompany receivable 0 0    
Total current assets 185,798 223,277    
Property, plant and equipment, net 1,979,420 1,816,143    
Intangible assets, net 704,948 725,949    
Goodwill 774,556 777,370    
Investment in wholly owned subsidiaries 861,102 790,882    
Deferred income tax asset   233    
Other long-term assets, net 12,842 8,201    
Total assets 4,518,666 4,342,055    
Liabilities, Mezzanine Equity and Partners’ Equity        
Accounts payable 90,873 101,052    
Short-term debt 0 0    
Current portion of long-term debt   0    
Accrued interest payable 48 47    
Accrued liabilities 34,429 33,395    
Taxes other than income tax 6,018 3,356    
Income tax payable 3,126 3,436    
Intercompany payable 1,509,949 1,512,177    
Total current liabilities 1,644,443 1,653,463    
Long-term debt, less current portion 55,977 61,849    
Deferred income tax liability 21,839 20,998    
Other long-term liabilities 46,598 50,630    
Series D preferred units 0      
Total partners' equity 2,749,809 2,555,115    
Total liabilities, mezzanine equity and partners’ equity $ 4,518,666 $ 4,342,055