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Derivatives (Pre-tax Gains and Losses) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Commodity | Cost of sales and merchandising revenues        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) on derivatives instruments recognized in earnings $ (11,353) $ (52,047) $ 229,320 $ (12,290)
Not Designated as Hedging Instrument | Interest rate contracts | Operating, administrative and general expenses        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) on derivatives instruments recognized in earnings 51 357 760 (363)
Designated as Hedging Instrument | Interest rate contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Interest rate derivative losses included in Other comprehensive income (loss) (2,044) 2,373 (12,520) (18,284)
Designated as Hedging Instrument | Interest rate contracts | Operating, administrative and general expenses        
Derivative Instruments, Gain (Loss) [Line Items]        
Interest rate derivatives losses included in Interest income (expense), net $ (1,746) $ (2,345) $ (5,020) $ (5,045)