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Derivatives (Schedule Of Effect On Operating Results) (Details) - Total Commodity Derivatives [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in Income, Supply & Logistics Product Costs | $ 1,410 | $ 12,180 | $ (12,023) | $ 5,331
Designated as Hedging Instrument |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in Income, Supply & Logistics Product Costs | 1,672 | 621 | (8,279) | (1,214)
Not Designated As Hedging Instrument |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in Income, Supply & Logistics Product Costs | $ (262) | $ 11,559 | $ (3,744) | $ 6,545

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