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Long-Term Obligations and Notes Payable - Retail Credit Facility (Details)
$ in Millions
1 Months Ended 6 Months Ended
Mar. 30, 2018
USD ($)
Aug. 31, 2015
USD ($)
Jun. 30, 2018
USD ($)
Mar. 30, 2018
CAD ($)
Jul. 31, 2015
USD ($)
Term loan          
Debt Instrument [Line Items]          
Face amount of debt $ 700,000,000        
Credit facility available     $ 698,300,000.0    
Proceeds from term loan 300,000,000        
Line of credit | Revolving credit facility          
Debt Instrument [Line Items]          
Credit facility available 1,000,000,000     $ 50.0  
Letter of credit          
Debt Instrument [Line Items]          
Credit facility available $ 300,000,000     $ 10.0  
Alon Retail Credit Facilities          
Debt Instrument [Line Items]          
Proceeds from term loan   $ 11,000,000      
Alon Retail Credit Facilities | Term loan          
Debt Instrument [Line Items]          
Face amount of debt         $ 110,000,000.0
Alon Retail Credit Facilities | Line of credit          
Debt Instrument [Line Items]          
Incremental term loan         30,000,000.0
Debt instrument, term     15 years    
Alon Retail Credit Facilities | Line of credit | Revolving credit facility          
Debt Instrument [Line Items]          
Credit facility available         $ 10,000,000
Incremental term loan   $ 30,000,000      
Line of credit outstanding     $ 0