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Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2013
Subsequent Events [Abstract]
Subsequent Events	(18) SUBSEQUENT EVENTS In April 2013, the Company entered into a definitive purchase agreement to acquire natural gas properties located in Pennsylvania prospective for the Marcellus Shale for approximately $93 million, subject to closing conditions. The Company intends to use its revolving credit facility to finance the acquisition. The Company anticipates closing the acquisition during the second quarter of 2013.