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CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Table 1 - Condensed Consolidating Balance Sheets (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Assets        
Cash and cash equivalents $ 15,128 $ 24,292 $ 27,205 $ 35,942
Receivables, net 157,341 176,775    
Inventories 29,549 26,857    
Other current assets 25,979 22,508    
Intercompany receivable 0 0    
Total current assets 227,997 250,432    
Property, plant and equipment, net 4,387,224 4,300,933    
Intangible assets, net 771,623 784,479    
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 105,208 101,681    
Total assets 6,586,713 6,535,233    
Liabilities and Partners' Equity        
Accounts payable 122,040 145,932    
Short-term debt 70,000 35,000    
Current portion of long-term debt 349,973 349,990    
Accrued interest payable 43,974 40,449    
Accrued liabilities 47,520 61,578    
Taxes other than income tax 12,751 14,385    
Income tax payable 6,378 4,172    
Intercompany payable 0 0    
Total current liabilities 652,636 651,506    
Long-term debt, less current portion 3,306,093 3,263,069    
Deferred income tax liability 23,032 22,272    
Other long-term liabilities 112,895 118,297    
Total partners' equity 2,492,057 2,480,089    
Total liabilities and partners' equity 6,586,713 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 (3,132,310) (3,112,164)    
Total current assets (3,132,310) (3,112,164)    
Property, plant and equipment, net 0 0    
Intangible assets, net 0 0    
Goodwill 0 0    
Investment in wholly owned subsidiaries (5,166,792) (5,008,132)    
Deferred income tax asset   0    
Other long-term assets, net 0 0    
Total assets (8,299,102) (8,120,296)    
Liabilities and Partners' Equity        
Accounts payable 0 0    
Short-term debt 0 0    
Current portion of long-term debt 0 0    
Accrued interest payable 0 0    
Accrued liabilities 0 0    
Taxes other than income tax 0 0    
Income tax payable 0 0    
Intercompany payable (3,132,310) (3,112,164)    
Total current liabilities (3,132,310) (3,112,164)    
Long-term debt, less current portion 0 0    
Deferred income tax liability 0 0    
Other long-term liabilities 0 0    
Total partners' equity (5,166,792) (5,008,132)    
Total liabilities and partners' equity (8,299,102) (8,120,296)    
Parent Company Guarantor [Member] | NuStar Energy | Reportable Legal Entities [Member]        
Assets        
Cash and cash equivalents 858 885 746 870
Receivables, net 0 0    
Inventories 0 0    
Other current assets 139 61    
Intercompany receivable 0 0    
Total current assets 997 946    
Property, plant and equipment, net 0 0    
Intangible assets, net 0 0    
Goodwill 0 0    
Investment in wholly owned subsidiaries 2,881,187 2,891,371    
Deferred income tax asset   0    
Other long-term assets, net 303 303    
Total assets 2,882,487 2,892,620    
Liabilities and Partners' Equity        
Accounts payable 3,309 4,078    
Short-term debt 0 0    
Current portion of long-term debt 0 0    
Accrued interest payable 0 0    
Accrued liabilities 655 1,105    
Taxes other than income tax 206 125    
Income tax payable 0 0    
Intercompany payable 322,257 322,296    
Total current liabilities 326,427 327,604    
Long-term debt, less current portion 0 0    
Deferred income tax liability 0 0    
Other long-term liabilities 0 0    
Total partners' equity 2,556,060 2,565,016    
Total liabilities and partners' equity 2,882,487 2,892,620    
Subsidiary Issuer [Member] | NuStar Logistics | Reportable Legal Entities [Member]        
Assets        
Cash and cash equivalents 26 29 6 5
Receivables, net 623 280    
Inventories 1,844 1,686    
Other current assets 13,905 11,412    
Intercompany receivable 3,132,310 3,112,164    
Total current assets 3,148,708 3,125,571    
Property, plant and equipment, net 1,874,347 1,893,720    
Intangible assets, net 56,174 58,530    
Goodwill 149,453 149,453    
Investment in wholly owned subsidiaries 19,795 24,162    
Deferred income tax asset   0    
Other long-term assets, net 70,343 65,684    
Total assets 5,318,820 5,317,120    
Liabilities and Partners' Equity        
Accounts payable 19,472 27,642    
Short-term debt 70,000 35,000    
Current portion of long-term debt 349,973 349,990    
Accrued interest payable 43,921 40,402    
Accrued liabilities 11,579 17,628    
Taxes other than income tax 3,906 7,110    
Income tax payable 902 732    
Intercompany payable 0 0    
Total current liabilities 499,753 478,504    
Long-term debt, less current portion 3,248,763 3,201,220    
Deferred income tax liability 1,262 1,262    
Other long-term liabilities 43,854 58,806    
Total partners' equity 1,525,188 1,577,328    
Total liabilities and partners' equity 5,318,820 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 11,039 8,611    
Other current assets 3,538 4,191    
Intercompany receivable 0 0    
Total current assets 14,577 12,802    
Property, plant and equipment, net 585,056 591,070    
Intangible assets, net 0 0    
Goodwill 170,652 170,652    
Investment in wholly owned subsidiaries 1,413,835 1,301,717    
Deferred income tax asset   0    
Other long-term assets, net 27,204 27,493    
Total assets 2,211,324 2,103,734    
Liabilities and Partners' Equity        
Accounts payable 5,232 13,160    
Short-term debt 0 0    
Current portion of long-term debt 0 0    
Accrued interest payable 0 0    
Accrued liabilities 8,214 9,450    
Taxes other than income tax 5,246 3,794    
Income tax payable 4 4    
Intercompany payable 1,326,659 1,277,691    
Total current liabilities 1,345,355 1,304,099    
Long-term debt, less current portion 0 0    
Deferred income tax liability 12 12    
Other long-term liabilities 14,191 8,861    
Total partners' equity 851,766 790,762    
Total liabilities and partners' equity 2,211,324 2,103,734    
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]        
Assets        
Cash and cash equivalents 14,244 23,378 $ 26,453 $ 35,067
Receivables, net 156,718 176,495    
Inventories 16,666 16,560    
Other current assets 8,397 6,844    
Intercompany receivable 0 0    
Total current assets 196,025 223,277    
Property, plant and equipment, net 1,927,821 1,816,143    
Intangible assets, net 715,449 725,949    
Goodwill 774,556 777,370    
Investment in wholly owned subsidiaries 851,975 790,882    
Deferred income tax asset   233    
Other long-term assets, net 7,358 8,201    
Total assets 4,473,184 4,342,055    
Liabilities and Partners' Equity        
Accounts payable 94,027 101,052    
Short-term debt 0 0    
Current portion of long-term debt 0 0    
Accrued interest payable 53 47    
Accrued liabilities 27,072 33,395    
Taxes other than income tax 3,393 3,356    
Income tax payable 5,472 3,436    
Intercompany payable 1,483,394 1,512,177    
Total current liabilities 1,613,411 1,653,463    
Long-term debt, less current portion 57,330 61,849    
Deferred income tax liability 21,758 20,998    
Other long-term liabilities 54,850 50,630    
Total partners' equity 2,725,835 2,555,115    
Total liabilities and partners' equity $ 4,473,184 $ 4,342,055