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Derivatives (Pre-tax Gains and Losses) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Commodity | Cost of sales and merchandising revenues        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) on derivatives instruments recognized in earnings $ (52,047) $ (27,586) $ (12,290) $ 25,469
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 357 (36) (363) (972)
Not Designated as Hedging Instrument | Foreign currency contract | Other Income, Net        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) on derivatives instruments recognized in earnings 0 (615) 0 (684)
Designated as Hedging Instrument | Interest rate contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Interest rate derivative losses included in Other Comprehensive Income (Loss) 2,373 (3,798) (18,284) (16,547)
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 $ (2,345) $ (224) $ (5,045) $ (243)