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Derivative Instruments and Hedging Activities (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Effect of derivative instruments on the Consolidated Statement of Operations
Ineffectiveness related to derivative instruments	$ 0	$ 0
Derivatives Designated as Hedging Instruments
Effect of derivative instruments on the Consolidated Statement of Operations
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into income (effective portion)	(70,775)	15,370
Derivatives Designated as Hedging Instruments | Natural Gas Revenues
Effect of derivative instruments on the Consolidated Statement of Operations
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into income (effective portion)	(70,557)	13,328
Derivatives Designated as Hedging Instruments | Crude Oil and Condensate Revenues
Effect of derivative instruments on the Consolidated Statement of Operations
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into income (effective portion)	(218)	2,042
Derivatives Designated as Hedging Instruments | Commodity contracts
Effect of derivative instruments on the Consolidated Statement of Operations
Amount of gain (loss) recognized in other comprehensive income (loss) on derivative (effective portion)	$ (133,310)	$ (60,946)

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The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (d)(1)

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Amount before tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580



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-Name Accounting Standards Codification

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580



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