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Asset Retirement Obligations (Tables) | 6 Months Ended
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Jun. 30, 2018
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation | A reconciliation of our liability for plugging and abandonment costs for the six months ended June 30, 2018 is as follows (in thousands):
|  | Six Months Ended June 30, 2018 |
Beginning of period |  | $ | 276,855 |
Liabilities incurred |  |  | 2,050 |
Acquisitions |  |  | 13,438 |
Liabilities settled |  |  | (2,080 | )
Accretion expense |  |  | 8,210 |
Change in estimate |  |  | 4,073 |
End of period |  |  | 302,546 |
Less current portion |  |  | (6,327 | )
Long-term asset retirement obligations |  | $ | 296,219 |

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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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