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Asset Retirement And Environmental Obligations (Reconciliation Carrying Amounts Of Short And Long Term Legal Obligations Associated With Retirement Of Property, Plant and Equipment) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Asset Retirement And Environmental Obligations [Abstract]
Carrying amount at beginning of period	$ 739
Liabilities incurred	15
Accretion expense	69
Settlement of obligation	(13)
Carrying amount at end of period	810
Noncurrent portion	$ 810	$ 739

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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