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Inventory Financing Agreements - Schedule Obligations Under Inventory Financing Agreements (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Supply Commitment [Line Items]    
Obligations under inventory financing agreements $ 592,621 $ 423,686
Supply and Offtake Agreements    
Supply Commitment [Line Items]    
Obligations under inventory financing agreements 466,071 312,185
Washington Refinery Intermediation Agreement    
Supply Commitment [Line Items]    
Obligations under inventory financing agreements $ 126,550 $ 111,501