Commitments And Contingencies (Details)	1 Months Ended		3 Months Ended
	Jul. 31, 2013 USD ($)	Aug. 31, 2011 USD ($)	Mar. 31, 2015 USD ($)	Mar. 31, 2015 CAD	Dec. 31, 2010 USD ($)	Mar. 31, 2010 CAD acre
Commitments And Contingencies [Abstract]
Investment in New Brunswick towards Company's commitment			$ 44,000,000	45,000,000
Guarantee obligations relative to the firms transportation agreements and gathering project and services			261,000,000
Unrecorded capital investments obligation, Exploration program acres coverage (acres)						2,500,000
Unrecorded capital investments obligation						47,000,000
Unrecorded promissory note payable						45,000,000
Promissory note payable, liability recognized			0
Obligation under transportation agreements			5,700,000,000
Litigation settlement, gross		11,000,000
Litigation, portion of profits considered for disgorgement					382,000,000
Disgorgement damages awarded in favor of the plaintiff and intervenor		24,000,000
Litigation, interest and attorney's fees claimed by plaintiffs		9,000,000			11,000,000
Disgorgement recoverable by plaintiff to be reversed	24,000,000
Actual damages recoverable by plaintiff to be reversed	$ 11,000,000