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Derivative Financial Instruments (Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income $ (13,516) $ 783  
Carrying Amount of the Hedged Assets, Inventories 45,139   $ 89,188
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets 378   $ 2,430
Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain or (Loss) Recognized in Income on Derivatives (15,155) (6,062)  
Revenue [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (13,359) 1,761  
Gains (Losses) Due to Ineffectiveness of Cash Flow Hedges (13,359) 1,761  
Cost of Goods Sold [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (157) (978)  
Gains (Losses) Due to Ineffectiveness of Cash Flow Hedges 2,149 (17)  
Commodity Contracts [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Loss Recognized in Other Comprehensive Income on Derivatives (8,963) 22,266  
Commodity Contracts [Member] | Revenue [Member] | Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain or (Loss) Recognized in Income on Derivatives (15,321) 936  
Commodity Contracts [Member] | Cost of Goods Sold [Member] | Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain or (Loss) Recognized in Income on Derivatives 166 (6,998)  
Commodity Contracts [Member] | Fair Value Hedging [Member] | Cost of Goods Sold [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (Losses) Due to Ineffectiveness of Cash Flow Hedges (1,553) 9,393  
Commodity Contracts [Member] | Fair Value Hedging [Member] | Cost of Goods Sold [Member] | Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (Losses) Due to Ineffectiveness of Cash Flow Hedges $ 3,859 $ (8,432)