Summary of Business and Basis of Presentation (Details Textual)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Wells Segment ft3 Customer	Jun. 30, 2012
Summary of Business and Basis of Presentation (Additional Textual) [Abstract]
Number of reporting segments			5
Annual distribution of natural gas			33,000,000,000
Natural gas customers			70,000
Annually market of natural gas			1,400,000,000
Number of natural gas producing wells and gas gathering assets			160
Commercial and agricultural customers			3,400
Antidilutive securities	1,053	6,548	0	0
EWR [Member]
Summary of Business and Basis of Presentation (Textual) [Abstract]
Gross percentage of working interest			46.00%
Average net revenue interest, percentage			39.00%