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Derivative Financial Instruments (Schedule Of Derivative Instruments, Gain (Loss) In Statement Of Financial Performance) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income $ 48,797 $ (9,556) $ 6,231
Carrying Amount of the Hedged Assets, Inventories 55,021 89,188  
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets (2,808) 2,430  
Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain or (Loss) Recognized in Income on Derivatives (15,114) 29,059 14,495
Revenue [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income   3,648 42,710
Gains (Losses) Due to Ineffectiveness of Cash Flow Hedges   3,648 42,427
Cost of Goods Sold [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income   1,258 (11,765)
Gains (Losses) Due to Ineffectiveness of Cash Flow Hedges 3,410 2,635 (9,464)
Net Income (Loss) From Discontinued Operations, Net Of Income Taxes [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income into Income 48,797 (14,462) (24,714)
Gains (Losses) Due to Ineffectiveness of Cash Flow Hedges 48,797 (14,462) (24,714)
Commodity Contracts [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Loss Recognized in Other Comprehensive Income on Derivatives 70,404 (9,642) (8,015)
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 (10,202) 11,565 (12,588)
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 (2,442) 21,101 25,825
Commodity Contracts [Member] | Net Income (Loss) From Discontinued Operations, Net Of Income Taxes [Member] | Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain or (Loss) Recognized in Income on Derivatives (2,470) (3,607) 1,258
Commodity Contracts [Member] | Fair Value Hedging [Member] | Revenue [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (Losses) Due to Ineffectiveness of Cash Flow Hedges     1,451
Commodity Contracts [Member] | Fair Value Hedging [Member] | Revenue [Member] | Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (Losses) Due to Ineffectiveness of Cash Flow Hedges     (1,734)
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 (844) 13,681 (6,229)
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 $ 4,254 $ (12,304) $ 8,530