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CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Table 1 (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Assets        
Cash and cash equivalents $ 103,019 $ 118,862 $ 111,637 $ 87,912
Receivables, net 145,526 145,064    
Inventories 38,700 38,749    
Other current assets 25,913 31,176    
Intercompany receivable 0 0    
Total current assets 313,158 333,851    
Property, plant and equipment, net 3,674,372 3,683,571    
Intangible assets, net 105,091 112,011    
Goodwill 696,637 696,637    
Investment in wholly owned subsidiaries 0 0    
Deferred income tax asset 2,193 2,858    
Other long-term assets, net 263,768 296,597    
Total assets 5,055,219 5,125,525    
Liabilities and Partners' Equity        
Payables 96,807 139,946    
Short-term debt 0 84,000    
Accrued interest payable 33,893 34,286    
Accrued liabilities 47,777 55,194    
Taxes other than income tax 12,613 12,810    
Income tax payable 3,186 5,977    
Intercompany payable 0 0    
Total current liabilities 194,276 332,213    
Long-term debt 3,205,693 3,055,612    
Long-term payable to related party 0 32,080    
Deferred income tax liability 26,485 24,810    
Other long-term liabilities 138,870 70,966    
Total partners' equity 1,489,895 1,609,844    
Total liabilities and partners' equity 5,055,219 5,125,525    
Eliminations        
Assets        
Cash and cash equivalents 0 0 0 0
Receivables, net 0 0    
Inventories 0 0    
Other current assets 0 0    
Intercompany receivable (1,547,576) (1,610,370)    
Total current assets (1,547,576) (1,610,370)    
Property, plant and equipment, net 0 0    
Intangible assets, net 0 0    
Goodwill 0 0    
Investment in wholly owned subsidiaries (4,121,129) (4,200,728)    
Deferred income tax asset (1,179) (1,179)    
Other long-term assets, net 0 0    
Total assets (5,669,884) (5,812,277)    
Liabilities and Partners' Equity        
Payables 0 0    
Short-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 (1,547,576) (1,610,370)    
Total current liabilities (1,547,576) (1,610,370)    
Long-term debt 0 0    
Long-term payable to related party   0    
Deferred income tax liability (1,179) (1,179)    
Other long-term liabilities 0 0    
Total partners' equity (4,121,129) (4,200,728)    
Total liabilities and partners' equity (5,669,884) (5,812,277)    
NuStar Energy        
Assets        
Cash and cash equivalents 663 885 864 923
Receivables, net 0 0    
Inventories 0 0    
Other current assets 77 140    
Intercompany receivable 0 0    
Total current assets 740 1,025    
Property, plant and equipment, net 0 0    
Intangible assets, net 0 0    
Goodwill 0 0    
Investment in wholly owned subsidiaries 2,120,652 2,205,904    
Deferred income tax asset 0 0    
Other long-term assets, net 1,188 933    
Total assets 2,122,580 2,207,862    
Liabilities and Partners' Equity        
Payables 31 12    
Short-term debt   0    
Accrued interest payable 0 0    
Accrued liabilities 644 723    
Taxes other than income tax 0 126    
Income tax payable 0 0    
Intercompany payable 505,099 508,363    
Total current liabilities 505,774 509,224    
Long-term debt 0 0    
Long-term payable to related party   0    
Deferred income tax liability 0 0    
Other long-term liabilities 0 0    
Total partners' equity 1,616,806 1,698,638    
Total liabilities and partners' equity 2,122,580 2,207,862    
NuStar Logistics        
Assets        
Cash and cash equivalents 3 4 6 6
Receivables, net 252 419    
Inventories 2,167 1,776    
Other current assets 11,772 11,026    
Intercompany receivable 1,547,576 1,610,370    
Total current assets 1,561,770 1,623,595    
Property, plant and equipment, net 1,912,598 1,915,370    
Intangible assets, net 45,541 48,961    
Goodwill 149,453 149,453    
Investment in wholly owned subsidiaries 43,229 48,547    
Deferred income tax asset 0 0    
Other long-term assets, net 223,037 255,957    
Total assets 3,935,628 4,041,883    
Liabilities and Partners' Equity        
Payables 22,398 52,650    
Short-term debt   84,000    
Accrued interest payable 33,877 34,271    
Accrued liabilities 7,393 32,816    
Taxes other than income tax 5,450 6,452    
Income tax payable 669 1,362    
Intercompany payable 0 0    
Total current liabilities 69,787 211,551    
Long-term debt 3,149,496 3,002,743    
Long-term payable to related party   26,638    
Deferred income tax liability 1,143 1,143    
Other long-term liabilities 73,483 37,209    
Total partners' equity 641,719 762,599    
Total liabilities and partners' equity 3,935,628 4,041,883    
NuPOP        
Assets        
Cash and cash equivalents 0 0 0 0
Receivables, net 0 0    
Inventories 2,409 3,648    
Other current assets 353 497    
Intercompany receivable 0 0    
Total current assets 2,762 4,145    
Property, plant and equipment, net 574,879 570,415    
Intangible assets, net 0 0    
Goodwill 170,652 170,652    
Investment in wholly owned subsidiaries 1,052,106 1,031,162    
Deferred income tax asset 0 0    
Other long-term assets, net 26,329 26,329    
Total assets 1,826,728 1,802,703    
Liabilities and Partners' Equity        
Payables 10,485 11,193    
Short-term debt   0    
Accrued interest payable 0 0    
Accrued liabilities 8,136 5,753    
Taxes other than income tax 3,153 3,325    
Income tax payable 5 9    
Intercompany payable 892,556 858,018    
Total current liabilities 914,335 878,298    
Long-term debt 0 0    
Long-term payable to related party   0    
Deferred income tax liability 36 36    
Other long-term liabilities 7,248 9,294    
Total partners' equity 905,109 915,075    
Total liabilities and partners' equity 1,826,728 1,802,703    
Non-Guarantor Subsidiaries        
Assets        
Cash and cash equivalents 102,353 117,973 $ 110,767 $ 86,983
Receivables, net 145,274 144,645    
Inventories 34,124 33,325    
Other current assets 13,711 19,513    
Intercompany receivable 0 0    
Total current assets 295,462 315,456    
Property, plant and equipment, net 1,186,895 1,197,786    
Intangible assets, net 59,550 63,050    
Goodwill 376,532 376,532    
Investment in wholly owned subsidiaries 905,142 915,115    
Deferred income tax asset 3,372 4,037    
Other long-term assets, net 13,214 13,378    
Total assets 2,840,167 2,885,354    
Liabilities and Partners' Equity        
Payables 63,893 76,091    
Short-term debt   0    
Accrued interest payable 16 15    
Accrued liabilities 31,604 15,902    
Taxes other than income tax 4,010 2,907    
Income tax payable 2,512 4,606    
Intercompany payable 149,921 243,989    
Total current liabilities 251,956 343,510    
Long-term debt 56,197 52,869    
Long-term payable to related party   5,442    
Deferred income tax liability 26,485 24,810    
Other long-term liabilities 58,139 24,463    
Total partners' equity 2,447,390 2,434,260    
Total liabilities and partners' equity $ 2,840,167 $ 2,885,354