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Acquisitions (Details)
bbl in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
mi
bbl
Dec. 31, 2015
USD ($)
Sep. 30, 2016
USD ($)
mi
bbl
Sep. 30, 2015
USD ($)
Business Acquisition [Line Items]        
Pipeline, Miles | mi 692   692  
Payments to Acquire Businesses, Gross     $ 195,000,000 $ 0
Active Storage Capacity | bbl 12.4   12.4  
St. Paul Park Logistics Assets [Member]        
Business Acquisition [Line Items]        
Pipeline, Miles | mi 2.5   2.5  
Payments to Acquire Businesses, Gross $ 195,000,000      
TexNew Mex 16 inch pipeline [Member]        
Business Acquisition [Line Items]        
Payments to Acquire Businesses, Gross   $ 170,000,000    
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] | TexNew Mex 16 inch pipeline [Member]        
Business Acquisition [Line Items]        
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable   421,031    
TexNew Mex Units [Member] | TexNew Mex 16 inch pipeline [Member]        
Business Acquisition [Line Items]        
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable   $ 80,000    
Crude Oil Storage Tanks [Member] | St. Paul Park Logistics Assets [Member]        
Business Acquisition [Line Items]        
Active Storage Capacity | bbl 4.0   4.0  
Pipelines and related assets | St. Paul Park Logistics Assets [Member]        
Business Acquisition [Line Items]        
Pipeline Segments 2   2  
Pipelines, Inactive [Member] | St. Paul Park Logistics Assets [Member]        
Business Acquisition [Line Items]        
Pipeline Segments 1   1