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Derivative Instruments and Hedging Activities (Details 4) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Derivative instruments and hedging activities |  |  |  |
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into income (effective portion) | $ (22,956) | $ 1,822 | $ (93,731) | $ 17,192
Unrealized Gain (Loss) on Derivatives |  |  | 12,933 |
Gain (loss) on derivative instruments | (25,285) |  | (25,285) |
Total | (25,285) | 1,822 | (96,060) | 17,192
Ineffectiveness related to derivative instruments | 0 | 0 | 0 | 0
Natural Gas Revenues |  |  |  |
Derivative instruments and hedging activities |  |  |  |
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into income (effective portion) | (22,320) | (272) | (92,877) | 13,056
Crude Oil and Condensate Revenues |  |  |  |
Derivative instruments and hedging activities |  |  |  |
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) into income (effective portion) | (636) | 2,094 | (854) | 4,136
Commodity contracts |  |  |  |
Derivative instruments and hedging activities |  |  |  |
Amount of gain (loss) recognized in other comprehensive income (loss) on derivative (effective portion) |  | 115,113 | (133,310) | 54,167
Derivatives Designated as Hedges |  |  |  |
Derivative instruments and hedging activities |  |  |  |
Realized gain (loss) on derivative instruments |  | 1,822 | (70,775) | 17,192
Derivatives Designated as Hedges | Natural Gas Revenues |  |  |  |
Derivative instruments and hedging activities |  |  |  |
Realized gain (loss) on derivative instruments |  | (272) | (70,557) | 13,056
Derivatives Designated as Hedges | Crude Oil and Condensate Revenues |  |  |  |
Derivative instruments and hedging activities |  |  |  |
Realized gain (loss) on derivative instruments |  | 2,094 | (218) | 4,136
Derivatives Not Designated as Hedges |  |  |  |
Derivative instruments and hedging activities |  |  |  |
Unrealized Gain (Loss) on Derivatives | 12,933 |  | 12,933 |
Derivatives Not Designated as Hedges | Natural Gas Revenues |  |  |  |
Derivative instruments and hedging activities |  |  |  |
Realized gain (loss) on derivative instruments | (22,320) |  | (22,320) |
Derivatives Not Designated as Hedges | Crude Oil and Condensate Revenues |  |  |  |
Derivative instruments and hedging activities |  |  |  |
Realized gain (loss) on derivative instruments | (636) |  | (636) |
Derivatives Not Designated as Hedges | Gain (loss) on derivative instruments |  |  |  |
Derivative instruments and hedging activities |  |  |  |
Unrealized Gain (Loss) on Derivatives | $ (15,262) |  | $ (15,262) |

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- Definition The realized gain (loss) on derivative instruments from the difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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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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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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