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Derivative Financial Instruments (Details) (Swap, Nymex Henry Hub [Member], USD $)	2 Months Ended	12 Months Ended
	Feb. 17, 2012 April To December 2012 [Member] Btu	Dec. 31, 2011 Calendar 2012 [Member] Btu	Dec. 31, 2011 Summer 2012 [Member] Btu
Schedule Of Derivative Instruments [Line Items]
Volume - MMBTU/Day	200,000	300,000	90,000
Average Price/MMBTU	$ 3.02	$ 5.03	$ 5.00
Fair Value		$ 196,075,000	$ 34,310,000

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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