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Asset Retirement Obligations (Details) (USD $)	12 Months Ended
Asset Retirement Obligations (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Roll forward of asset retirement obligation liability
Balance beginning of year	$ 10,006,769	$ 9,834,021
Accretion expense	495,389	489,077
Liabilities incurred	418,305	87,106
Liabilities settled	(787,745)	(404,594)
Revisions	896,488	1,159
Balance end of year	$ 11,029,206	$ 10,006,769

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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