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Inventory Financing Agreements - Washington Refinery Intermediation Agreement (Details) - USD ($)
$ in Thousands
12 Months Ended
Nov. 01, 2019
Jan. 11, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Supply Commitment [Line Items]          
Interest expense     $ 74,839 $ 39,768 $ 31,632
Washington Refinery Intermediation Agreement          
Supply Commitment [Line Items]          
Percentage of receivables and inventory for deferred payment   95.00%      
Amount of deferred payment arrangement   $ 90,000      
Commitment fee percentage 0.75% 1.50%      
Long-term line of credit     63,800    
Interest expense     6,400    
London Interbank Offered Rate (LIBOR) | Washington Refinery Intermediation Agreement          
Supply Commitment [Line Items]          
Basis spread on variable rate   3.25%      
Letter of Credit | Washington Refinery Intermediation Agreement          
Supply Commitment [Line Items]          
Line of credit, current     127,200    
Inventory Intermediation | Washington Refinery Intermediation Agreement          
Supply Commitment [Line Items]          
Cost of goods and services sold     $ 3,700