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Asset Retirement Obligations - Additional Information (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Jun. 30, 2013
Reconciliation Of Changes In Asset Retirement Obligations |
Liability settled or disposed in current period | $ (75,060)
Bullwinkle Platform |
Reconciliation Of Changes In Asset Retirement Obligations |
Liability settled or disposed in current period | (22,700)
Permian Properties |
Reconciliation Of Changes In Asset Retirement Obligations |
Liability settled or disposed in current period | $ (15,200)

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 143 -Paragraph 22 -Subparagraph c(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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