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Asset Retirement Obligations - Reconciliation of Beginning and Ending Aggregate Carrying Amounts of Asset Retirement Obligations (Parenthetical) (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Sep. 30, 2013
Reconciliation Of Changes In Asset Retirement Obligations |  |
Liability settled or disposed in current period(1) | $ (100,653) | [1]
Bullwinkle Platform |  |
Reconciliation Of Changes In Asset Retirement Obligations |  |
Liability settled or disposed in current period(1) | (22,700) | [1]
Permian Properties |  |
Reconciliation Of Changes In Asset Retirement Obligations |  |
Liability settled or disposed in current period(1) | (15,200) | [1]
East Breaks Region | Platforms, pipelines and associated wells |  |
Reconciliation Of Changes In Asset Retirement Obligations |  |
Liability settled or disposed in current period(1) | (17,100) | [1]
West Delta Region | Platforms, pipelines and associated wells |  |
Reconciliation Of Changes In Asset Retirement Obligations |  |
Liability settled or disposed in current period(1) | $ (21,300) | [1]
[1] | Liability settled or disposed during the nine-month period ended September 30, 2013 includes $22.7 million for the settlement of a plugging and abandonment obligation associated with the Company’s Bullwinkle platform in the Gulf of Mexico and $15.2 million disposed in conjunction with the sale of the Permian Properties in February 2013. Additionally, $17.1 million and $21.3 million were spent in the East Breaks and West Delta regions, respectively, to decommission various platforms, pipeline and associated wells during the nine-month period ended September 30, 2013.

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- Definition Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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