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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, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in Income, Supply & Logistics Product Costs | $ (12,543) | $ (8,230) | $ (13,433) | $ (6,849)
Designated as Hedging Instrument |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in Income, Supply & Logistics Product Costs | (9,398) | (4,021) | (9,951) | (1,835)
Not Designated As Hedging Instrument |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in Income, Supply & Logistics Product Costs | $ (3,145) | $ (4,209) | $ (3,482) | $ (5,014)

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