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Inventory Financing Agreements - Washington Refinery Intermediation Agreement (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Nov. 01, 2019
Jan. 11, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Supply Commitment [Line Items]              
Supply and exchange agreement expenses     $ 17,523 $ 18,348 $ 52,611 $ 57,336  
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          
Unused capacity, commitment fee percentage 0.75% 1.50%          
Outstanding receivable advance balance     48,500   48,500   $ 63,800
Supply and exchange agreement expenses     500 2,000 2,200 4,800  
Washington Refinery Intermediation Agreement | Inventory Intermediation              
Supply Commitment [Line Items]              
Handling fees     1,000 $ 900 3,100 $ 2,700  
Washington Refinery Intermediation Agreement | Letter of Credit              
Supply Commitment [Line Items]              
Balance outstanding on the credit facility     $ 71,300   $ 71,300   $ 127,200
London Interbank Offered Rate (LIBOR)              
Supply Commitment [Line Items]              
Margin on LIBOR rate   3.25%