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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

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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