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Asset Retirement Obligation (Tables) | 12 Months Ended
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Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation | Our asset retirement obligations primarily represent the estimated present value of the amounts we will incur to plug, abandon and remediate our producing properties at the end of their productive lives. Significant inputs used in determining such obligations include estimates of plugging and abandonment costs, estimated future inflation rates and well life. The inputs are calculated based on historical data as well as current estimated costs. A reconciliation of our liability for plugging and abandonment costs for the years ended December 31, 2014 and 2013 are as follows (in thousands):
| 2014 |  |  | 2013 |
Beginning of period | $ | 230,077 |  |  | $ | 146,478 |
Liabilities incurred |  | 8,602 |  |  |  | 8,731 |
Acquisitions |  | 11,927 |  |  |  | ¾ |
Liability released |  | (8,309 | ) |  |  | ¾ |
Liabilities settled |  | (4,442 | ) |  |  | (424 | )
Disposition of wells |  | (13,951 | ) |  |  | (3,129 | )
Accretion expense |  | 15,226 |  |  |  | 10,778 |
Change in estimate |  | 48,333 |  |  |  | 67,643 |
End of period |  | 287,463 |  |  |  | 230,077 |
Less current portion |  | (15,067 | ) |  |  | (5,037 | )
Long-term asset retirement obligations | $ | 272,396 |  |  | $ | 225,040 |

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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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