Commitments And Contingencies (Details)	0 Months Ended	1 Months Ended		3 Months Ended					1 Months Ended
	Aug. 24, 2011 USD ($)	Jul. 31, 2013 USD ($)	Dec. 31, 2010 item	Mar. 31, 2014 USD ($)	Mar. 31, 2014 CAD	Feb. 28, 2014 USD ($)	Mar. 31, 2010 CAD acre	Feb. 28, 2009 USD ($)	Dec. 31, 2010 Licensing Agreement [Member] item
Commitments And Contingencies [Line Items]
Unrecorded capital investments obligation, Exploration program acres coverage (acres)							2,500,000
Unrecorded capital investments obligation							47,000,000
Period licenses require capital investments be made, years				3 years
Unrecorded promissory note payable							44,500,000
Obligations for demand and similar charges under transportation agreements				38,200,000	42,200,000
Number of extension options									2
Extension term									1 year
Extension expiration									Mar. 16, 2015
Promissory note payable, liability recognized				0
Obligation under transportation agreements				3,600,000,000
Guarantee obligations relative to the firms transportation agreements and gathering project and services				100,000,000
Number of prospects			2
Litigation settlement, gross	11,400,000
Litigation, portion of profits considered for disgorgement								381,500,000
Disgorgement damages awarded in favor of the plantiff and intervenor	23,900,000
Litigation, interest and attorney's fees claimed by plaintiffs	8,900,000					11,400,000
Disgorgement recoverable by plaintiff to be reversed		23,900,000
Actual damages recoverable by plaintiff to be reversed		11,400,000
Litigation settlement upheld		$ 11,400,000