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CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Table 1 - Condensed Consolidating Balance Sheets (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Assets          
Cash and cash equivalents $ 24,579   $ 24,292 $ 33,615 $ 35,942
Receivables, net 164,768   176,775    
Inventories 24,761   26,857    
Other current assets 62,766   22,508    
Intercompany receivable 0   0    
Total current assets 276,874   250,432    
Property, plant and equipment, net 4,484,848   4,300,933    
Intangible assets, net 745,912   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 118,663   101,681    
Total assets 6,720,958   6,535,233    
Liabilities, Mezzanine Equity and Partners’ Equity          
Accounts payable 154,212   145,932    
Short-term debt 10,500   35,000    
Current portion of long-term debt 0   349,990    
Accrued interest payable 30,845   40,449    
Accrued liabilities 97,298   61,578    
Taxes other than income tax 19,695   14,385    
Income tax payable 4,576   4,172    
Intercompany payable 0   0    
Total current liabilities 317,126   651,506    
Long-term debt, less current portion 3,376,852   3,263,069    
Deferred income tax liability 23,343   22,272    
Other long-term liabilities 96,911   118,297    
Series D preferred units 559,844 $ 370,711 0    
Total partners' equity 2,346,882   2,480,089    
Total liabilities, mezzanine equity and partners’ equity 6,720,958   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 (2,914,432)   (3,112,164)    
Total current assets (2,914,432)   (3,112,164)    
Property, plant and equipment, net 0   0    
Intangible assets, net 0   0    
Goodwill 0   0    
Investment in wholly owned subsidiaries (5,124,172)   (5,008,132)    
Deferred income tax asset     0    
Other long-term assets, net 0   0    
Total assets (8,038,604)   (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 (2,914,432)   (3,112,164)    
Total current liabilities (2,914,432)   (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 (5,124,172)   (5,008,132)    
Total liabilities, mezzanine equity and partners’ equity (8,038,604)   (8,120,296)    
Parent Company Guarantor [Member] | NuStar Energy | Reportable Legal Entities [Member]          
Assets          
Cash and cash equivalents 1,164   885 894 870
Receivables, net 0   0    
Inventories 0   0    
Other current assets 122   61    
Intercompany receivable 187,967   0    
Total current assets 189,253   946    
Property, plant and equipment, net 0   0    
Intangible assets, net 0   0    
Goodwill 0   0    
Investment in wholly owned subsidiaries 2,793,521   2,891,371    
Deferred income tax asset     0    
Other long-term assets, net 303   303    
Total assets 2,983,077   2,892,620    
Liabilities, Mezzanine Equity and Partners’ Equity          
Accounts payable 13,636   4,078    
Short-term debt 0   0    
Current portion of long-term debt     0    
Accrued interest payable 0   0    
Accrued liabilities 929   1,105    
Taxes other than income tax 63   125    
Income tax payable 0   0    
Intercompany payable 0   322,296    
Total current liabilities 14,628   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 559,844        
Total partners' equity 2,408,605   2,565,016    
Total liabilities, mezzanine equity and partners’ equity 2,983,077   2,892,620    
Subsidiary Issuer [Member] | NuStar Logistics | Reportable Legal Entities [Member]          
Assets          
Cash and cash equivalents 4,238   29 28 5
Receivables, net 82   280    
Inventories 1,875   1,686    
Other current assets 16,961   11,412    
Intercompany receivable 2,726,465   3,112,164    
Total current assets 2,749,621   3,125,571    
Property, plant and equipment, net 1,846,330   1,893,720    
Intangible assets, net 51,463   58,530    
Goodwill 149,453   149,453    
Investment in wholly owned subsidiaries 29,961   24,162    
Deferred income tax asset     0    
Other long-term assets, net 77,144   65,684    
Total assets 4,903,972   5,317,120    
Liabilities, Mezzanine Equity and Partners’ Equity          
Accounts payable 26,423   27,642    
Short-term debt 10,500   35,000    
Current portion of long-term debt     349,990    
Accrued interest payable 30,785   40,402    
Accrued liabilities 16,608   17,628    
Taxes other than income tax 7,152   7,110    
Income tax payable 364   732    
Intercompany payable 0   0    
Total current liabilities 91,832   478,504    
Long-term debt, less current portion 3,313,528   3,201,220    
Deferred income tax liability 1,262   1,262    
Other long-term liabilities 45,099   58,806    
Series D preferred units 0        
Total partners' equity 1,452,251   1,577,328    
Total liabilities, mezzanine equity and partners’ equity 4,903,972   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 6,822   8,611    
Other current assets 1,284   4,191    
Intercompany receivable 0   0    
Total current assets 8,106   12,802    
Property, plant and equipment, net 619,284   591,070    
Intangible assets, net 0   0    
Goodwill 170,652   170,652    
Investment in wholly owned subsidiaries 1,450,865   1,301,717    
Deferred income tax asset     0    
Other long-term assets, net 26,861   27,493    
Total assets 2,275,768   2,103,734    
Liabilities, Mezzanine Equity and Partners’ Equity          
Accounts payable 5,935   13,160    
Short-term debt 0   0    
Current portion of long-term debt     0    
Accrued interest payable 0   0    
Accrued liabilities 7,971   9,450    
Taxes other than income tax 5,893   3,794    
Income tax payable 0   4    
Intercompany payable 1,393,208   1,277,691    
Total current liabilities 1,413,007   1,304,099    
Long-term debt, less current portion 0   0    
Deferred income tax liability 12   12    
Other long-term liabilities 13,124   8,861    
Series D preferred units 0        
Total partners' equity 849,625   790,762    
Total liabilities, mezzanine equity and partners’ equity 2,275,768   2,103,734    
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]          
Assets          
Cash and cash equivalents 19,177   23,378 $ 32,693 $ 35,067
Receivables, net 164,686   176,495    
Inventories 16,064   16,560    
Other current assets 44,399   6,844    
Intercompany receivable 0   0    
Total current assets 244,326   223,277    
Property, plant and equipment, net 2,019,234   1,816,143    
Intangible assets, net 694,449   725,949    
Goodwill 774,556   777,370    
Investment in wholly owned subsidiaries 849,825   790,882    
Deferred income tax asset     233    
Other long-term assets, net 14,355   8,201    
Total assets 4,596,745   4,342,055    
Liabilities, Mezzanine Equity and Partners’ Equity          
Accounts payable 108,218   101,052    
Short-term debt 0   0    
Current portion of long-term debt     0    
Accrued interest payable 60   47    
Accrued liabilities 71,790   33,395    
Taxes other than income tax 6,587   3,356    
Income tax payable 4,212   3,436    
Intercompany payable 1,521,224   1,512,177    
Total current liabilities 1,712,091   1,653,463    
Long-term debt, less current portion 63,324   61,849    
Deferred income tax liability 22,069   20,998    
Other long-term liabilities 38,688   50,630    
Series D preferred units 0        
Total partners' equity 2,760,573   2,555,115    
Total liabilities, mezzanine equity and partners’ equity $ 4,596,745   $ 4,342,055