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Holly Energy Partners (Narrative) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
mi
Dec. 31, 2015
USD ($)
Customers
mi
bbl
Dec. 31, 2013
USD ($)
shares
Feb. 22, 2016
Schedule of Equity Method Investments [Line Items]        
Percentage of general partner interest   50.00%    
Concentration risk, precentage of total revenues   10.00%    
Payments to Acquire Property, Plant, and Equipment   $ 0    
Variable Interest Entity, Primary Beneficiary [Member]        
Schedule of Equity Method Investments [Line Items]        
Percentage of ownership in variable interest entity   39.00%    
Percentage of general partner interest   2.00%    
Number of significant customers | Customers   2    
Concentration risk, precentage of total revenues   81.00%    
Equity Method Investment, Ownership Percentage   75.00%    
Long-term Purchase Commitment, Amount   $ 244,900    
Sale of Stock, Number of Shares Issued in Transaction | shares     1,875,000  
Partners' Capital Account, Sale of Units     $ 73,400  
Payments to Acquire Property, Plant, and Equipment   62,000    
Purchase Obligation Minimum Annualized Payment   $ 15,300    
SLC Pipeline        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Ownership Percentage   25.00%    
Frontier Pipeline [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Ownership Percentage   50.00%    
Payments to Acquire Equity Method Investments   $ 55,000    
Length of pipeline | mi   289    
Production barrel capacity per day | bbl   72,000    
UNEV Pipeline [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Ownership Percentage   75.00%    
General Partner HFC [Member] | Variable Interest Entity, Primary Beneficiary [Member]        
Schedule of Equity Method Investments [Line Items]        
Sale of Stock, Number of Shares Issued in Transaction | shares     1,875,000  
Subsequent Event [Member] | Osage Pipeline [Member] [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Ownership Percentage       50.00%
Length of pipeline | mi 135