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Derivatives (Schedule Of Effect On Operating Results) (Details) - Total Commodity Derivatives [Member] - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain (Loss) Recognized in Income, Supply & Logistics Product Costs | $ 7,379 | $ (890)
Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain (Loss) Recognized in Income, Supply & Logistics Product Costs | 6,286 | (553)
Not Designated As Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Gain (Loss) Recognized in Income, Supply & Logistics Product Costs | $ 1,093 | $ (337)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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