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CONDENSED CONSOLIDATING FINANCIAL STATEMENTS Table 3 - Condensed Consolidating Statements of Cash Flows (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net cash provided by operating activities $ 243,850 $ 208,988
Cash flows from investing activities:    
Capital expenditures (248,521) (108,849)
Change in accounts payable related to capital expenditures (19,320) 6,851
Proceeds from sale or disposition of assets 2,097 1,966
Proceeds from insurance recoveries 78,419 0
Investment in subsidiaries   0
Proceeds from Axeon term loan 0 110,000
Acquisitions (37,502) (1,476,719)
Net cash provided by (used in) investing activities (224,827) (1,466,751)
Cash flows from financing activities:    
Debt borrowings 1,133,272 1,602,161
Debt repayments (1,333,521) (1,696,239)
Proceeds from note offering, net of issuance costs 0 543,313
Proceeds from issuance of Series D preferred units 400,000 0
Payment of issuance costs for Series D preferred units (29,289) 0
Proceeds from issuance of other preferred units, net of issuance costs 0 371,802
Proceeds from issuance of common units, net of issuance costs 10,000 643,858
Contributions from general partner 0 13,597
Distributions to preferred unitholders (32,713) (10,696)
Distributions to common unitholders and general partner (172,324) (216,139)
Proceeds from termination of interest rate swaps 8,048 0
Contributions from distributions to affiliates   0
Net intercompany activity 0 0
Other, net (6,023) (1,294)
Net cash (used in) provided by financing activities (22,550) 1,250,363
Effect of foreign exchange rate changes on cash (421) 649
Net increase (decrease) in cash and cash equivalents (3,948) (6,751)
Cash and cash equivalents as of the beginning of the period 24,292 35,942
Cash and cash equivalents as of the end of the period 20,344 29,191
Eliminations [Member]    
Cash flows from operating activities:    
Net cash provided by operating activities (307,567) (340,263)
Cash flows from investing activities:    
Capital expenditures 0 0
Change in accounts payable related to capital expenditures 0 0
Proceeds from sale or disposition of assets 0 0
Proceeds from insurance recoveries 0  
Investment in subsidiaries   1,262,126
Proceeds from Axeon term loan   0
Acquisitions 0 0
Net cash provided by (used in) investing activities 0 1,262,126
Cash flows from financing activities:    
Debt borrowings 0 0
Debt repayments 0 0
Proceeds from note offering, net of issuance costs   0
Proceeds from issuance of Series D preferred units 0  
Payment of issuance costs for Series D preferred units 0  
Proceeds from issuance of other preferred units, net of issuance costs   0
Proceeds from issuance of common units, net of issuance costs 0 0
Contributions from general partner   0
Distributions to preferred unitholders 49,071 16,044
Distributions to common unitholders and general partner 258,496 324,219
Proceeds from termination of interest rate swaps 0  
Contributions from distributions to affiliates   (1,262,126)
Net intercompany activity 0 0
Other, net 0 0
Net cash (used in) provided by financing activities 307,567 (921,863)
Effect of foreign exchange rate changes on cash 0 0
Net increase (decrease) in cash and cash equivalents 0 0
Cash and cash equivalents as of the beginning of the period 0 0
Cash and cash equivalents as of the end of the period 0 0
Parent Company Guarantor [Member] | NuStar Energy | Reportable Legal Entities [Member]    
Cash flows from operating activities:    
Net cash provided by operating activities 200,803 225,566
Cash flows from investing activities:    
Capital expenditures 0 0
Change in accounts payable related to capital expenditures 0 0
Proceeds from sale or disposition of assets 0 0
Proceeds from insurance recoveries 0  
Investment in subsidiaries   (1,262,000)
Proceeds from Axeon term loan   0
Acquisitions 0 0
Net cash provided by (used in) investing activities 0 (1,262,000)
Cash flows from financing activities:    
Debt borrowings 0 0
Debt repayments 0 0
Proceeds from note offering, net of issuance costs   0
Proceeds from issuance of Series D preferred units 400,000  
Payment of issuance costs for Series D preferred units (29,289)  
Proceeds from issuance of other preferred units, net of issuance costs   371,802
Proceeds from issuance of common units, net of issuance costs 10,000 643,858
Contributions from general partner   13,597
Distributions to preferred unitholders (32,713) (10,696)
Distributions to common unitholders and general partner (172,324) (216,139)
Proceeds from termination of interest rate swaps 0  
Contributions from distributions to affiliates   0
Net intercompany activity (374,973) 236,622
Other, net (1,493) (2,613)
Net cash (used in) provided by financing activities (200,792) 1,036,431
Effect of foreign exchange rate changes on cash 0 0
Net increase (decrease) in cash and cash equivalents 11 (3)
Cash and cash equivalents as of the beginning of the period 885 870
Cash and cash equivalents as of the end of the period 896 867
Subsidiary Issuer [Member] | NuStar Logistics | Reportable Legal Entities [Member]    
Cash flows from operating activities:    
Net cash provided by operating activities 31,209 85,203
Cash flows from investing activities:    
Capital expenditures (17,136) (19,639)
Change in accounts payable related to capital expenditures 495 (2,823)
Proceeds from sale or disposition of assets 1,385 1,898
Proceeds from insurance recoveries 0  
Investment in subsidiaries   0
Proceeds from Axeon term loan   110,000
Acquisitions 0 0
Net cash provided by (used in) investing activities (15,256) 89,436
Cash flows from financing activities:    
Debt borrowings 1,122,272 1,536,761
Debt repayments (1,316,621) (1,625,739)
Proceeds from note offering, net of issuance costs   543,313
Proceeds from issuance of Series D preferred units 0  
Payment of issuance costs for Series D preferred units 0  
Proceeds from issuance of other preferred units, net of issuance costs   0
Proceeds from issuance of common units, net of issuance costs 0 0
Contributions from general partner   0
Distributions to preferred unitholders (16,356) (5,348)
Distributions to common unitholders and general partner (86,162) (108,070)
Proceeds from termination of interest rate swaps 8,048  
Contributions from distributions to affiliates   1,262,000
Net intercompany activity 279,080 (1,778,816)
Other, net (4,466) 1,319
Net cash (used in) provided by financing activities (14,205) (174,580)
Effect of foreign exchange rate changes on cash 0 0
Net increase (decrease) in cash and cash equivalents 1,748 59
Cash and cash equivalents as of the beginning of the period 29 5
Cash and cash equivalents as of the end of the period 1,777 64
Guarantor Subsidiaries [Member] | NuPOP | Reportable Legal Entities [Member]    
Cash flows from operating activities:    
Net cash provided by operating activities 58,105 45,790
Cash flows from investing activities:    
Capital expenditures (8,164) (5,588)
Change in accounts payable related to capital expenditures (5,173) (35)
Proceeds from sale or disposition of assets 16 12
Proceeds from insurance recoveries 0  
Investment in subsidiaries   0
Proceeds from Axeon term loan   0
Acquisitions (37,502) 0
Net cash provided by (used in) investing activities (50,823) (5,611)
Cash flows from financing activities:    
Debt borrowings 0 0
Debt repayments 0 0
Proceeds from note offering, net of issuance costs   0
Proceeds from issuance of Series D preferred units 0  
Payment of issuance costs for Series D preferred units 0  
Proceeds from issuance of other preferred units, net of issuance costs   0
Proceeds from issuance of common units, net of issuance costs 0 0
Contributions from general partner   0
Distributions to preferred unitholders (16,357) (5,348)
Distributions to common unitholders and general partner (86,162) (108,069)
Proceeds from termination of interest rate swaps 0  
Contributions from distributions to affiliates   0
Net intercompany activity 95,237 73,237
Other, net 0 1
Net cash (used in) provided by financing activities (7,282) (40,179)
Effect of foreign exchange rate changes on cash 0 0
Net increase (decrease) in cash and cash equivalents 0 0
Cash and cash equivalents as of the beginning of the period 0 0
Cash and cash equivalents as of the end of the period 0 0
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]    
Cash flows from operating activities:    
Net cash provided by operating activities 261,300 192,692
Cash flows from investing activities:    
Capital expenditures (223,221) (83,622)
Change in accounts payable related to capital expenditures (14,642) 9,709
Proceeds from sale or disposition of assets 696 56
Proceeds from insurance recoveries 78,419  
Investment in subsidiaries   (126)
Proceeds from Axeon term loan   0
Acquisitions 0 (1,476,719)
Net cash provided by (used in) investing activities (158,748) (1,550,702)
Cash flows from financing activities:    
Debt borrowings 11,000 65,400
Debt repayments (16,900) (70,500)
Proceeds from note offering, net of issuance costs   0
Proceeds from issuance of Series D preferred units 0  
Payment of issuance costs for Series D preferred units 0  
Proceeds from issuance of other preferred units, net of issuance costs   0
Proceeds from issuance of common units, net of issuance costs 0 0
Contributions from general partner   0
Distributions to preferred unitholders (16,358) (5,348)
Distributions to common unitholders and general partner (86,172) (108,080)
Proceeds from termination of interest rate swaps 0  
Contributions from distributions to affiliates   126
Net intercompany activity 656 1,468,957
Other, net (64) (1)
Net cash (used in) provided by financing activities (107,838) 1,350,554
Effect of foreign exchange rate changes on cash (421) 649
Net increase (decrease) in cash and cash equivalents (5,707) (6,807)
Cash and cash equivalents as of the beginning of the period 23,378 35,067
Cash and cash equivalents as of the end of the period $ 17,671 $ 28,260