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Inventory Financing Agreements - Washington Refinery Intermediation Agreement (Details) - USD ($)
3 Months Ended
Jan. 11, 2019
Dec. 05, 2018
Mar. 31, 2019
Mar. 31, 2018
Supply Commitment [Line Items]        
Supply and exchange agreement expenses     $ 18,710,000 $ 8,377,000
Washington Refinery Intermediation Agreement        
Supply Commitment [Line Items]        
Percentage of receivables and inventory for deferred payment arrangement 95.00%      
Amount of deferred payment arrangement $ 90,000,000      
Variable interest rate basis   P3M    
Unused capacity, commitment fee percentage   1.50%    
Outstanding receivable advance balance     46,000,000  
Maximum borrowing amount     46,400,000.0  
Supply and exchange agreement expenses     1,200,000  
Washington Refinery Intermediation Agreement | Shipping and Handling        
Supply Commitment [Line Items]        
Handling fees     800,000  
Washington Refinery Intermediation Agreement | Letter of Credit        
Supply Commitment [Line Items]        
Balance outstanding on the credit facility     $ 62,700,000  
London Interbank Offered Rate (LIBOR) | Washington Refinery Intermediation Agreement        
Supply Commitment [Line Items]        
Margin on LIBOR rate   3.25%