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Debt (Carrying Amounts Of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jan. 31, 2017
Debt Instrument [Line Items]        
Unamortized discount       $ (2,400)
Total long-term debt $ 2,409,148 $ 2,498,993    
Long-term debt 2,409,148 2,498,993    
Five Point Eight Seven Five Percentage Senior Notes Due Two Thousand Twenty-Six [Member] [Member]        
Debt Instrument [Line Items]        
Principal 1,000,000 1,000,000    
Unamortized discount (7,600) (8,315)    
Total long-term debt 992,400 991,685    
HEP        
Debt Instrument [Line Items]        
HEP Credit Agreement 921,000 1,012,000    
Total long-term debt 1,416,748 1,507,308    
Long-term Debt and Capital Lease Obligations 1,416,748 1,507,308    
HEP | Six Percent Senior Notes Due Two Thousand Twenty Four [Member] [Member]        
Debt Instrument [Line Items]        
Principal 500,000 500,000 $ 100,000  
Unamortized discount (4,252) (4,692)    
Total long-term debt 495,748 495,308    
Level 2 [Member]        
Debt Instrument [Line Items]        
Financial Liabilities Fair Value Disclosure 6,840 12,375    
Level 2 [Member] | Senior Notes [Member]        
Debt Instrument [Line Items]        
Financial Liabilities Fair Value Disclosure 1,065,980 1,113,470    
Level 2 [Member] | Senior Notes [Member] | HEP        
Debt Instrument [Line Items]        
Financial Liabilities Fair Value Disclosure $ 512,840 $ 525,120