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Derivatives and Risk Management (Before Tax Effect of Basis Swaps that do not Qualify for Hedge Accounting Consolidated Statements of Operations) (Details) (Gas Sales [Member], Basis Swaps [Member], USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Gas Sales [Member] \| Basis Swaps [Member]
Derivative Instruments, Unrealized Gain (Loss) Recognized in Earnings	$ (1,967)	$ 1,620	$ (159)	$ 9,496
Derivative Instruments, Realized Gain (Loss) Recognized in Earnings	$ (22)	$ (2,580)	$ (2,377)	$ (9,811)

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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