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Derivative Instruments and Hedging Activities (Details 4) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Effect of derivative instruments on the Consolidated Statement of Operations |  |  |
Ineffectiveness related to derivative instruments | $ 0 | $ 0 | $ 0
Natural Gas Revenues |  |  |
Effect of derivative instruments on the Consolidated Statement of Operations |  |  |
Amount of Gain (Loss) Recognized in Income on Derivative Not Designated |  | (494) | (965)
Derivatives Designated as Hedging Instruments |  |  |
Effect of derivative instruments on the Consolidated Statement of Operations |  |  |
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) | 57,002 | 236,326 | 86,340
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 OCI into Income (Effective Portion) | 52,733 | 225,108 | 84,937
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 OCI into Income (Effective Portion) | 4,269 | 11,218 | 1,403
Derivatives Designated as Hedging Instruments | Commodity contracts |  |  |
Effect of derivative instruments on the Consolidated Statement of Operations |  |  |
Amount of Gain (Loss) Recognized In OCI on Derivative (Effective Portion) | $ (4,523) | $ 88,705 | $ 267,667

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + 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 (e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition 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) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e689-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41638-113959 + Details
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- Definition 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993 + Details
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