Commitments And Contingencies (Terminated Acquisition Of Marcellus Assets) (Details) (USD $)	1 Months Ended	12 Months Ended	0 Months Ended		3 Months Ended
	Jul. 31, 2011	Dec. 31, 2014	Dec. 14, 2011	Apr. 16, 2014	Mar. 31, 2014
Commitments And Contingencies [Line Items]
Payment to acquire acquisitions	$ 110,000,000
Litigation settlement expense		19,034,000
SM Energy Company
Commitments And Contingencies [Line Items]
Termination date			December 14, 2011
SM Energy Litigation [Member]
Commitments And Contingencies [Line Items]
Amount of deposit forfeited				6,000,000
Settlement amount				5,000,000
Note issuance amount				4,500,000
Litigation settlement expense					$ 19,000,000
Number of common stock shares warrants can be converted into				2,100,000
Warrants exercise price				$ 5.29