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Derivatives - Schedule of Notional Amounts of Outstanding Derivative Positions (Details)
bbl in Thousands
3 Months Ended
Mar. 31, 2021
bbl
Credit Derivatives [Line Items]  
Derivative contracts, barrels 250
Purchases  
Credit Derivatives [Line Items]  
Derivative contracts, barrels 3,025
Sales  
Credit Derivatives [Line Items]  
Derivative contracts, barrels 3,275
Futures  
Credit Derivatives [Line Items]  
Derivative contracts, barrels 250
Futures | Purchases  
Credit Derivatives [Line Items]  
Derivative contracts, barrels 500
Futures | Sales  
Credit Derivatives [Line Items]  
Derivative contracts, barrels 250
Swaps  
Credit Derivatives [Line Items]  
Derivative contracts, barrels 500
Swaps | Purchases  
Credit Derivatives [Line Items]  
Derivative contracts, barrels 2,525
Swaps | Sales  
Credit Derivatives [Line Items]  
Derivative contracts, barrels 3,025