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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2015
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, 2015, 2014 and 2013 (in thousands).
| 2015 |  | 2014 |  | 2013
Beginning balance | $ | 54,402 |  |  | $ | 424,117 |  |  | $ | 498,410 |
Liability incurred upon acquiring and drilling wells | 1,662 |  |  | 4,968 |  |  | 5,078 |
Revisions in estimated cash flows(1) | 44,060 |  |  | (5,848 | ) |  | (3,077 | )
Liability settled or disposed in current period(2) | (1,023 | ) |  | (377,927 | ) |  | (113,071 | )
Accretion | 4,477 |  |  | 9,092 |  |  | 36,777 |
Ending balance | 103,578 |  |  | 54,402 |  |  | 424,117 |
Less: current portion | 8,399 |  |  | — |  |  | 87,063 |
Asset retirement obligations, net of current | $ | 95,179 |  |  | $ | 54,402 |  |  | $ | 337,054 |
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(1) | Revisions for the year ended December 31, 2015 relate primarily to changes in estimated well lives.
(2) | Liability settled or disposed for the year ended December 31, 2014, includes $366.0 million associated with the Gulf Properties sold in February 2014, as discussed in Note 3.

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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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