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Derivatives - Fair Value Amounts of Derivatives and Placement in Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Prepaid and other current assets    
Derivative Instruments, Gain (Loss) [Line Items]    
Cash collateral $ 400 $ 1,500
Other non-current assets    
Derivative Instruments, Gain (Loss) [Line Items]    
Cash collateral 9,500 9,500
Commodity derivatives | Prepaid and other current assets    
Derivative Instruments, Gain (Loss) [Line Items]    
Asset (Liability) 3,953 1,346
J. Aron repurchase obligation derivative | Over the Counter | Obligations under inventory financing agreements    
Derivative Instruments, Gain (Loss) [Line Items]    
Asset (Liability) (26,114) (20,797)
MLC terminal obligation derivative | Over the Counter | Obligations under inventory financing agreements    
Derivative Instruments, Gain (Loss) [Line Items]    
Asset (Liability) (10,250) (10,161)
Interest rate derivatives | Other accrued liabilities    
Derivative Instruments, Gain (Loss) [Line Items]    
Asset (Liability) 0 (966)
Interest rate derivatives | Other liabilities    
Derivative Instruments, Gain (Loss) [Line Items]    
Asset (Liability) $ 0 $ (2,027)