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CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Table 1 - Condensed Consolidating Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Assets        
Cash and cash equivalents $ 24,292 $ 35,942 $ 118,862 $ 87,912
Receivables, net 176,775 170,610    
Inventories 26,857 37,945    
Other current assets 22,508 132,686    
Intercompany receivable 0 0    
Total current assets 250,432 377,183    
Property, plant and equipment, net 4,300,933 3,722,283    
Intangible assets, net 784,479 127,083    
Goodwill 1,097,475 696,637 696,637  
Investment in wholly owned subsidiaries 0 0    
Deferred income tax asset 233 2,051    
Other long-term assets, net 101,681 105,308    
Total assets 6,535,233 5,030,545    
Liabilities and Partners' Equity        
Current portion of long-term debt 349,990 0    
Payables 145,932 118,686    
Short-term debt 35,000 54,000    
Accrued interest payable 40,449 34,030    
Accrued liabilities 61,578 60,485    
Taxes other than income tax 14,385 15,685    
Income tax payable 4,172 6,510    
Intercompany payable 0 0    
Total current liabilities 651,506 289,396    
Long-term debt, less current portion 3,263,069 3,014,364    
Deferred income tax liability 22,272 22,204    
Other long-term liabilities 118,297 92,964    
Total partners’ equity 2,480,089 1,611,617    
Total liabilities and partners' equity 6,535,233 5,030,545    
Eliminations        
Assets        
Cash and cash equivalents 0 0 0 0
Receivables, net 0 0    
Inventories 0 0    
Other current assets 0 0    
Intercompany receivable (3,112,164) (1,366,200)    
Total current assets (3,112,164) (1,366,200)    
Property, plant and equipment, net 0 0    
Intangible assets, net 0 0    
Goodwill 0 0    
Investment in wholly owned subsidiaries (5,008,132) (4,095,880)    
Deferred income tax asset 0 0    
Other long-term assets, net 0 0    
Total assets (8,120,296) (5,462,080)    
Liabilities and Partners' Equity        
Current portion of long-term debt 0      
Payables 0 0    
Short-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 (3,112,164) (1,366,200)    
Total current liabilities (3,112,164) (1,366,200)    
Long-term debt, less current portion 0 0    
Deferred income tax liability 0 0    
Other long-term liabilities 0 0    
Total partners’ equity (5,008,132) (4,095,880)    
Total liabilities and partners' equity (8,120,296) (5,462,080)    
Parent Company Guarantor [Member] | NuStar Energy | Reportable Legal Entities [Member]        
Assets        
Cash and cash equivalents 885 870 885 923
Receivables, net 0 0    
Inventories 0 0    
Other current assets 61 61    
Intercompany receivable 0 0    
Total current assets 946 931    
Property, plant and equipment, net 0 0    
Intangible assets, net 0 0    
Goodwill 0 0    
Investment in wholly owned subsidiaries 2,891,371 1,964,736    
Deferred income tax asset 0 0    
Other long-term assets, net 303 1,255    
Total assets 2,892,620 1,966,922    
Liabilities and Partners' Equity        
Current portion of long-term debt 0      
Payables 4,078 2,436    
Short-term debt 0 0    
Accrued interest payable 0 0    
Accrued liabilities 1,105 1,070    
Taxes other than income tax 125 125    
Income tax payable 0 0    
Intercompany payable 322,296 257,497    
Total current liabilities 327,604 261,128    
Long-term debt, less current portion 0 0    
Deferred income tax liability 0 0    
Other long-term liabilities 0 0    
Total partners’ equity 2,565,016 1,705,794    
Total liabilities and partners' equity 2,892,620 1,966,922    
Subsidiary Issuer [Member] | NuStar Logistics | Reportable Legal Entities [Member]        
Assets        
Cash and cash equivalents 29 5 4 6
Receivables, net 280 3,040    
Inventories 1,686 2,216    
Other current assets 11,412 120,350    
Intercompany receivable 3,112,164 1,308,415    
Total current assets 3,125,571 1,434,026    
Property, plant and equipment, net 1,893,720 1,935,172    
Intangible assets, net 58,530 71,033    
Goodwill 149,453 149,453    
Investment in wholly owned subsidiaries 24,162 34,778    
Deferred income tax asset 0 0    
Other long-term assets, net 65,684 63,586    
Total assets 5,317,120 3,688,048    
Liabilities and Partners' Equity        
Current portion of long-term debt 349,990      
Payables 27,642 24,272    
Short-term debt 35,000 54,000    
Accrued interest payable 40,402 34,008    
Accrued liabilities 17,628 7,118    
Taxes other than income tax 7,110 6,854    
Income tax payable 732 1,326    
Intercompany payable 0 0    
Total current liabilities 478,504 127,578    
Long-term debt, less current portion 3,201,220 2,956,338    
Deferred income tax liability 1,262 1,862    
Other long-term liabilities 58,806 34,358    
Total partners’ equity 1,577,328 567,912    
Total liabilities and partners' equity 5,317,120 3,688,048    
Guarantor Subsidiaries [Member] | NuPOP | Reportable Legal Entities [Member]        
Assets        
Cash and cash equivalents 0 0 0 0
Receivables, net 0 0    
Inventories 8,611 2,005    
Other current assets 4,191 1,829    
Intercompany receivable 0 0    
Total current assets 12,802 3,834    
Property, plant and equipment, net 591,070 589,139    
Intangible assets, net 0 0    
Goodwill 170,652 170,652    
Investment in wholly owned subsidiaries 1,301,717 1,221,717    
Deferred income tax asset 0 0    
Other long-term assets, net 27,493 28,587    
Total assets 2,103,734 2,013,929    
Liabilities and Partners' Equity        
Current portion of long-term debt 0      
Payables 13,160 7,124    
Short-term debt 0 0    
Accrued interest payable 0 0    
Accrued liabilities 9,450 10,766    
Taxes other than income tax 3,794 3,253    
Income tax payable 4 5    
Intercompany payable 1,277,691 1,108,703    
Total current liabilities 1,304,099 1,129,851    
Long-term debt, less current portion 0 0    
Deferred income tax liability 12 13    
Other long-term liabilities 8,861 9,436    
Total partners’ equity 790,762 874,629    
Total liabilities and partners' equity 2,103,734 2,013,929    
Non-Guarantor Subsidiaries | Reportable Legal Entities [Member]        
Assets        
Cash and cash equivalents 23,378 35,067 $ 117,973 $ 86,983
Receivables, net 176,495 167,570    
Inventories 16,560 33,724    
Other current assets 6,844 10,446    
Intercompany receivable 0 57,785    
Total current assets 223,277 304,592    
Property, plant and equipment, net 1,816,143 1,197,972    
Intangible assets, net 725,949 56,050    
Goodwill 777,370 376,532    
Investment in wholly owned subsidiaries 790,882 874,649    
Deferred income tax asset 233 2,051    
Other long-term assets, net 8,201 11,880    
Total assets 4,342,055 2,823,726    
Liabilities and Partners' Equity        
Current portion of long-term debt 0      
Payables 101,052 84,854    
Short-term debt 0 0    
Accrued interest payable 47 22    
Accrued liabilities 33,395 41,531    
Taxes other than income tax 3,356 5,453    
Income tax payable 3,436 5,179    
Intercompany payable 1,512,177 0    
Total current liabilities 1,653,463 137,039    
Long-term debt, less current portion 61,849 58,026    
Deferred income tax liability 20,998 20,329    
Other long-term liabilities 50,630 49,170    
Total partners’ equity 2,555,115 2,559,162    
Total liabilities and partners' equity $ 4,342,055 $ 2,823,726