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Derivatives (Pre-tax Gains and Losses) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Commodity | Cost of sales and merchandising revenues        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) on derivatives instruments recognized in earnings $ (27,586) $ (51,059) $ 25,469 $ (30,451)
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 (36) 521 (972) 1,662
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 (615) 372 (684) (1,163)
Designated as Hedging Instrument | Interest rate contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Interest rate derivative gains (losses) included in Other Comprehensive Income (Loss) (3,798) 159 (16,547) 226
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) $ (224) $ 54 $ (243) $ 126