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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 | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
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 | $ 689 | $ 758
Derivative Liability, Fair Value, Gross Liability | 3,247 | 3,357
GrossAmountDerivativeAssetsOffset | (689) | (758)
NetAmountofDerivativeAssets | 0 | 0
GrossAmountofDerivativeLiabilitiesOffset | 3,247 | 3,357
Net amount of derivative liabilities | $ 0 | $ 0

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