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ASSET RETIREMENT OBLIGATION (Details) (USD $)	6 Months Ended
ASSET RETIREMENT OBLIGATION (Details) (USD $)	Jun. 30, 2013
ASSET RETIREMENT OBLIGATION
Fair market value of cash held in escrow that is legally restricted for potential plugging and abandonment liability	$ 3,200,000
Reconciliation of asset retirement obligations
Balance at beginning of year	25,236,000
Liabilities incurred in current year	395,000
Liabilities settled in current year	(1,194,000)
Accretion expense	1,093,000
Balance at end of period	$ 25,530,000

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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