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Derivatives (Pre-tax Gains and Losses) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Commodity | Cost of sales and merchandising revenues        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) on derivatives instruments recognized in earnings $ 8,797 $ (13,364) $ 39,757 $ 57,291
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 186 (1,065) (720) (2,055)
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 (366) 0 (1,833)
Designated as Hedging Instrument | Interest rate contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Interest rate derivative losses included in Other Comprehensive Income (Loss) (2,475) (7,926) (20,657) (12,917)
Designated as Hedging Instrument | Interest rate contracts | Operating, administrative and general expenses        
Derivative Instruments, Gain (Loss) [Line Items]        
Interest rate derivatives gains (losses) included in Interest income (expense), net $ (1,917) $ 0 $ (2,700) $ 165