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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2013
Asset Retirement Obligation Disclosure [Abstract] |
Reconciliation of Beginning and Ending Aggregate Carrying Amounts of Asset Retirement Obligations | The following table presents the balance and activity of the asset retirement obligations for the years ended December 31, 2013, 2012 and 2011 (in thousands).
| 2013 |  | 2012 |  | 2011
Asset retirement obligations at January 1 | $ | 498,410 |  |  | $ | 128,116 |  |  | $ | 119,877 |
Liability incurred upon acquiring and drilling wells | 5,078 |  |  | 7,479 |  |  | 5,716 |
Liability assumed in acquisition(1) | — |  |  | 371,365 |  |  | — |
Revisions in estimated cash flows | (3,077 | ) |  | 34,654 |  |  | 7,574 |
Liability settled or disposed in current period(2) | (113,071 | ) |  | (72,200 | ) |  | (14,419 | )
Accretion(3) | 36,777 |  |  | 28,996 |  |  | 9,368 |
Asset retirement obligations at December 31 | 424,117 |  |  | 498,410 |  |  | 128,116 |
Less: current portion | 87,063 |  |  | 118,504 |  |  | 32,906 |
Asset retirement obligations, net of current | $ | 337,054 |  |  | $ | 379,906 |  |  | $ | 95,210 |
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(1) | Represents asset retirement obligations assumed in the acquisitions of oil and natural gas properties in the Gulf of Mexico during the second quarter of 2012.
(2) | Year ended December 31, 2013 includes $45.3 million for the decommissioning of various platforms, pipeline and associated wells in the Gulf of Mexico and $15.2 million of asset retirement obligations disposed in conjunction with the sale of the Permian Properties. Years ended December 31, 2013 and 2012 include the settlement of plugging and abandonment obligations associated with properties in the Gulf of Mexico. Year ended December 31, 2011 includes amounts related to the Permian Basin and east Texas properties sold during 2011.
(3) | Years ended December 31, 2013 and 2012 include accretion attributable to asset retirement obligations assumed in the acquisitions of oil and natural gas properties in the Gulf of Mexico during the second quarter of 2012.

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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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