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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, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Gas Sales [Member] \| Basis Swaps [Member]
Derivative Instruments, Unrealized Gain (Loss) Recognized in Earnings	$ 1,223	$ 906
Derivative Instruments, Realized Gain (Loss) Recognized in Earnings	$ 1,018	$ (2,256)

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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