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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 2018 and 2017 (in thousands):
| 2018 |  |  | 2017 |
Beginning of period | $ | 276,855 |  |  | $ | 257,943 |
Liabilities incurred |  | 3,376 |  |  |  | 7,724 |
Acquisitions |  | 13,438 |  |  |  | — |
Liabilities settled |  | (5,052 | ) |  |  | (7,965 | )
Disposition of wells |  | (13,332 | ) |  |  | (8,078 | )
Accretion expense |  | 25,456 |  |  |  | 14,711 |
Change in estimate |  | 12,013 |  |  |  | 12,520 |
End of period |  | 312,754 |  |  |  | 276,855 |
Less current portion |  | (5,485 | ) |  |  | (6,327 | )
Long-term asset retirement obligations | $ | 307,269 |  |  | $ | 270,528 |

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- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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