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Debt (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2014
Jun. 30, 2013
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]            
Maximum borrowing capacity under revolving credit agreement       $ 1,000,000,000    
Letters of Credit Outstanding, Amount       $ 6,000,000    
Effective interest rate on debt       2.572% 2.152%  
Long-term debt       $ 1,040,040,000 $ 1,054,297,000  
Gains (Losses) on Extinguishment of Debt $ (7,700,000) $ (22,100,000)   1,370,000 7,677,000 $ 22,109,000
Redemption premium on early extinguishment of debt   14,200,000        
Amortization of Debt Discount (Premium)   $ 7,900,000        
Plains [Member]            
Debt Instrument [Line Items]            
Proceeds from sale of storage assets       $ 40,000,000    
Plains [Member] | Lease [Member]            
Debt Instrument [Line Items]            
Term of lease, years       P15Y    
HEP            
Debt Instrument [Line Items]            
Maximum borrowing capacity under revolving credit agreement       $ 850,000,000    
Borrowings outstanding under revolving credit agreement       712,000,000 571,000,000  
Long-term debt       1,008,752,000 866,986,000  
Letter of Credit [Member] | HEP            
Debt Instrument [Line Items]            
Maximum borrowing capacity under revolving credit agreement       $ 50,000,000    
9.875% Senior Notes Due 2017            
Debt Instrument [Line Items]            
Stated interest rate, senior notes   9.875%        
Senior notes   $ 286,800,000        
Debt Instrument, Repurchased Face Amount   $ 301,000,000        
6.875% Senior Notes Due 2018            
Debt Instrument [Line Items]            
Stated interest rate, senior notes     6.875% 6.875%    
Long-term debt         154,144,000  
Senior notes     $ 150,000,000   150,000,000  
Gains (Losses) on Extinguishment of Debt     (1,400,000)      
Redemption premium on early extinguishment of debt     (5,200,000)      
Amortization of Debt Discount (Premium)     3,800,000      
Extinguishment of Debt, Amount     $ 155,200,000      
8.25% Senior Notes Due 2018 | HEP            
Debt Instrument [Line Items]            
Stated interest rate, senior notes 8.25%     8.25%    
Senior notes $ 150,000,000.0          
Redemption premium on early extinguishment of debt 6,200,000          
Senior Notes Aggregate Redemption Amount 156,200,000          
Amortization of Financing Costs and Discounts $ 1,500,000          
Debt Instrument, Maturity Date Mar. 01, 2018          
6.5% Senior Notes Due 2020 | HEP            
Debt Instrument [Line Items]            
Stated interest rate, senior notes       6.50%    
Long-term debt       $ 296,752,000 295,986,000  
Senior notes       $ 300,000,000 $ 300,000,000  
Debt Instrument, Maturity Date       Mar. 01, 2020