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Asset Retirement Obligations (Tables) | 9 Months Ended
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Sep. 30, 2013
Asset Retirement Obligation Disclosure [Abstract] |
Reconciliation of Beginning and Ending Aggregate Carrying Amounts of Asset Retirement Obligation | A reconciliation of the beginning and ending aggregate carrying amounts of the asset retirement obligations for the period from December 31, 2012 to September 30, 2013 is as follows (in thousands):
Asset retirement obligations at December 31, 2012 | $ | 498,410 |
Liability incurred upon acquiring and drilling wells | 4,145 |
Revisions in estimated cash flows | (206 | )
Liability settled or disposed in current period(1) | (100,653 | )
Accretion | 28,051 |
Asset retirement obligations at September 30, 2013 | 429,747 |
Less: current portion | 71,446 |
Asset retirement obligations, net of current | $ | 358,301 |
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(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 Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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