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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Accounting Policies [Abstract]
Amount of Transitional Energy Facility Assessment and Public Utilities Assessment included in revenues and cost of sales	$ 700,000	$ 900,000	$ 2,900,000	$ 3,400,000
Decrease in TEFA revenue based tax rate	25.00%		25.00%		25.00%
Impairment charges			0	1,100,000
Amount of costs related to interests in proved and unproved properties in Pennsylvania, net of amortization	$ 9,000,000		$ 9,000,000		$ 9,000,000
Shares of treasury stock held (in shares)	134,783		134,783		145,414

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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