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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 | 3 Months Ended | 1 Months Ended
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Mar. 31, 2014 | Feb. 28, 2014 Gulf Properties
Reconciliation Of Changes In Asset Retirement Obligations |  |  |
Liability settled or disposed in current period(1) | $ (377,578) | [1] | $ (366,000)
[1] | Includes $366.0 million associated with the Gulf Properties sold in February 2014.

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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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