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Segment Information (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Segment Reporting Information [Line Items]    
Reportable segments 2  
Other Revenue, Net $ 12.9 $ 11.9
Twelve Inch Refined Products Pipeline Project
   
Segment Reporting Information [Line Items]    
Description Of Pipeline Acquired 12  
SLC Pipeline [Member] | SLC Pipeline [Member] | HEP [Member]
   
Segment Reporting Information [Line Items]    
Equity Method Investment, Ownership Percentage 25.00%  
UNEV Pipeline [Member]
   
Segment Reporting Information [Line Items]    
Percentage of interest owned in pipeline project 75.00%