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Derivatives (Schedule Of Fair Value Of Derivative Assets And Liabilities) (Details) (Other Current Assets [Member], Total Commodity Derivatives [Member], Not Designated As Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Other Current Assets [Member] | Total Commodity Derivatives [Member] | Not Designated As Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | $ 1,053 | $ 758
Derivative Asset, Fair Value, Gross Liability | (851) | (758)
Derivative Liability, Fair Value, Gross Liability | 851 | 3,357
Derivative Liability, Fair Value, Gross Asset | 851 | 3,357
Derivative Liability | 0 | 0
Derivative Asset | $ 202 | $ 0

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