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Organization (Details)
$ / shares in Units, bbl in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
mi
shares
bbl
Sep. 30, 2016
USD ($)
mi
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
operating_segments
mi
shares
bbl
Jun. 30, 2016
USD ($)
Sep. 30, 2017
$ / shares
Dec. 31, 2016
shares
Business Acquisition [Line Items]              
Pipeline, Miles | mi 705     705      
Active Storage Capacity | bbl 12.4     12.4      
Number of Reportable Segments | operating_segments       2      
Western Refining, Inc. [Member]              
Business Acquisition [Line Items]              
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest 52.50%            
Investor [Member]              
Business Acquisition [Line Items]              
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest 47.50%            
St. Paul Park Logistics Assets [Member]              
Business Acquisition [Line Items]              
Pipeline, Miles | mi   2.5          
Payments to Acquire Businesses, Gross   $ 195,000,000          
Subordinated Units [Member] | Western Refining, Inc. [Member]              
Business Acquisition [Line Items]              
Limited Partners' Capital Account, Units Outstanding | shares 0     0     22,811,000
Common Units [Member] | Western Refining, Inc. [Member]              
Business Acquisition [Line Items]              
Limited Partners' Capital Account, Units Outstanding | shares 32,018,847     32,018,847     9,207,847
Common Units [Member] | Investor [Member]              
Business Acquisition [Line Items]              
Limited Partners' Capital Account, Units Outstanding | shares 28,993,863     28,993,863      
Common Units [Member] | St. Paul Park Logistics Assets [Member]              
Business Acquisition [Line Items]              
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable   628,224          
Common Units [Member] | St. Paul Park Logistics Assets [Member]              
Business Acquisition [Line Items]              
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable   $ 628,224          
Fee Based Revenues [Member]              
Business Acquisition [Line Items]              
Revenues: Third-party $ 703,000   $ 677,000 $ 1,322,000 $ 1,367,000    
Fee Based Revenues [Member] | St. Paul Park Logistics Assets [Member]              
Business Acquisition [Line Items]              
Revenues: Third-party         $ 0    
Subsequent Event [Member] | Common Units [Member]              
Business Acquisition [Line Items]              
Conversion of Stock, Shares Converted | $ / shares           $ 0.4906