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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Accounting Policies [Abstract]
Amount of Transitional Energy Facility Assessment and Public Utilities Assessment included in revenues and cost of sales	$ 200,000	$ 700,000	$ 600,000	$ 2,900,000
Impairment charges			0	0
Amount of costs related to interests in proved and unproved properties in Pennsylvania, net of amortization	$ 8,800,000		$ 8,800,000		$ 8,900,000
Shares of treasury stock held (in shares)	128,979		128,979		148,890

The adjustment to expense previously capitalized costs of drilling exploratory wells when proved reserves are not found or when the entity obtains information that raises substantial doubt about the economic or operational viability of the project.

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