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Asset Retirement Obligations (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, 2013 is as follows (in thousands):
Asset retirement obligations at December 31, 2012 | $ | 498,410 |
Liability incurred upon acquiring and drilling wells | 1,102 |
Liability settled or disposed in current period | (50,722 | )
Accretion | 9,779 |
Asset retirement obligations at March 31, 2013 | 458,569 |
Less: current portion | 91,113 |
Asset retirement obligations, net of current | $ | 367,456 |

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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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