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Fair Value (Change In Fair Value Of Level 3 Derivative Liability) (Details) (Level 3 [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability balance December 31, 2011	$ 131
Decrease in fair value of price protection instrument	(75)
Derecognition of derivative liability	(56)
Derivative liability balance December 31, 2012

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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