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Derivatives (Schedule Of Effect On Operating Results) (Details) - Total Commodity Derivatives [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in Income, Supply & Logistics Product Costs | $ 6,432 | $ (12,543) | $ 13,811 | $ (13,433)
Designated as Hedging Instrument |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in Income, Supply & Logistics Product Costs | 5,546 | (9,398) | 11,832 | (9,951)
Not Designated As Hedging Instrument |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in Income, Supply & Logistics Product Costs | $ 886 | $ (3,145) | $ 1,979 | $ (3,482)

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