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Inventory Financing Agreements - Washington Refinery Intermediation Agreement (Details) - USD ($)
$ in Thousands
3 Months Ended
Nov. 01, 2019
Jan. 11, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Supply Commitment [Line Items]          
Supply and exchange agreement expenses     $ 18,674 $ 18,710  
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     30,000   $ 63,800
Supply and exchange agreement expenses     1,000 1,200  
Washington Refinery Intermediation Agreement | Inventory Intermediation          
Supply Commitment [Line Items]          
Handling fees     1,100 $ 800  
Washington Refinery Intermediation Agreement | Letter of Credit          
Supply Commitment [Line Items]          
Balance outstanding on the credit facility     $ 100,000   $ 127,200
London Interbank Offered Rate (LIBOR) | Washington Refinery Intermediation Agreement          
Supply Commitment [Line Items]          
Margin on LIBOR rate   3.25%