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Asset Retirement Obligations (Tables) | 9 Months Ended
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Sep. 30, 2018
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation | A reconciliation of our liability for plugging and abandonment costs for the nine months ended September 30, 2018 is as follows (in thousands):
|  | Nine Months Ended September 30, 2018 |
Beginning of period |  | $ | 276,855 |
Liabilities incurred |  |  | 2,668 |
Disposition of wells |  |  | (8,665 | )
Acquisitions |  |  | 13,438 |
Liabilities settled |  |  | (3,803 | )
Accretion expense |  |  | 12,132 |
Change in estimate |  |  | 4,347 |
End of period |  |  | 296,972 |
Less current portion |  |  | (6,327 | )
Long-term asset retirement obligations |  | $ | 290,645 |

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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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