Inventory Financing Agreements - Schedule Obligations Under Inventory Financing Agreements (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Supply Commitment [Line Items]
Obligations under inventory financing agreements	$ 423,686	$ 656,162
Supply and Offtake Agreements
Supply Commitment [Line Items]
Obligations under inventory financing agreements	312,185	517,001
Washington Refinery Intermediation Agreement
Supply Commitment [Line Items]
Obligations under inventory financing agreements	$ 111,501	$ 139,161