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Summary Of Significant Accounting Policies (Reconciliation Of Liability For Asset Retirement Obligations Table) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Summary Of Significant Accounting Policies [Abstract]
Asset retirement obligation at beginning of year	$ 931,000	$ 1,407,000
Liabilities settled	(336,000)	(510,000)
Revisions in estimated cash flows	35,000
Accretion expense	33,000	34,000
Asset retirement obligation at end of year	663,000	931,000
Asset Retirement Obligations, Other Current Liabilities		$ 906,000

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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