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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2017
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation | The following is a reconciliation of our liability for plugging and abandonment costs as of December 31, 2017 and 2016 (in thousands):
| 2017 |  |  | 2016 |
Beginning of period | $ | 257,943 |  |  | $ | 264,137 |
Liabilities incurred |  | 7,724 |  |  |  | 2,694 |
Acquisitions |  | — |  |  |  | 21,900 |
Liabilities settled |  | (7,965 | ) |  |  | (11,511 | )
Disposition of wells |  | (8,078 | ) |  |  | (10,540 | )
Accretion expense |  | 14,711 |  |  |  | 18,021 |
Change in estimate |  | 12,520 |  |  |  | (26,758 | )
End of period |  | 276,855 |  |  |  | 257,943 |
Less current portion |  | (6,327 | ) |  |  | (7,271 | )
Long-term asset retirement obligations | $ | 270,528 |  |  | $ | 250,672 |

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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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