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Derivative Instruments and Hedging Activities (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Natural Gas Revenues
Effect of derivative instruments on the Condensed Consolidated Statement of Operations
Amount of Gain (Loss) Recognized in Income on Derivatives Not Designated	$ (500)	$ (1,000)	$ (200)
Derivatives Designated as Hedging Instruments
Effect of derivative instruments on the Condensed Consolidated Statement of Operations
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	236,326	86,340	172,990
Derivatives Designated as Hedging Instruments | Natural Gas Revenues
Effect of derivative instruments on the Condensed Consolidated Statement of Operations
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	225,108	84,937	154,960
Derivatives Designated as Hedging Instruments | Crude Oil and Condensate Revenues
Effect of derivative instruments on the Condensed Consolidated Statement of Operations
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	11,218	1,403	18,030
Derivatives Designated as Hedging Instruments | Commodity contracts
Effect of derivative instruments on the Condensed Consolidated Statement of Operations
Amount of Gain (Loss) Recognized In OCI on Derivative (Effective Portion)	88,705	267,667	75,655
Derivatives Not Designated as Hedging Instruments | Commodity contracts | Natural Gas Revenues
Effect of derivative instruments on the Condensed Consolidated Statement of Operations
Amount of Gain (Loss) Recognized in Income on Derivatives Not Designated	$ (494)	$ (965)	$ (226)

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Net gain (loss) from the increase (decrease) in fair value of derivative instrument not designated as hedging instrument.

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Before tax amount of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income. Also includes reclassification adjustments of an entity's share of an equity investee's deferred hedging gain (loss) realized in net income.

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Before tax amount of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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