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Asset Retirement Obligation (Details) (USD $)	12 Months Ended
Asset Retirement Obligation (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Asset Retirement Obligation [Line Items]
Asset Retirement Obligation, Beginning Balance	$ 2,099,000	$ 1,927,000
Accretion expense	120,000	132,000	96,000
Liabilities incurred	26,000	92,000
Liabilities settled	(417,000)	(52,000)
Revisions in estimated liabilities	(48,000)		502,000
Asset Retirement Obligation, Ending Balance	1,780,000	2,099,000	1,927,000
Decrease in asset reitrement obligation	26,000	92,000	559,000
Tennessee [Member]
Asset Retirement Obligation [Line Items]
Decrease in asset reitrement obligation	$ 348,000

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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