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Asset Retirement Obligations (Tables) | 9 Months Ended
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Sep. 30, 2019
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, 2019 and the year ended December 31, 2018 is as follows (in thousands):
|  | Nine Months Ended September 30, 2019 |  |  | Year Ended December 31, 2018 |
Beginning of period |  | $ | 312,754 |  |  | $ | 276,855 |
Liabilities incurred |  |  | 3,059 |  |  |  | 3,376 |
Acquisitions |  |  | — |  |  |  | 13,438 |
Liabilities settled |  |  | (5,091 | ) |  |  | (5,052 | )
Disposition of wells (a) |  |  | (80,014 | ) |  |  | (13,332 | )
Accretion expense |  |  | 12,289 |  |  |  | 25,456 |
Change in estimate |  |  | (2,247 | ) |  |  | 12,013 |
End of period |  |  | 240,750 |  |  |  | 312,754 |
Less current portion |  |  | (5,485 | ) |  |  | (5,485 | )
Long-term asset retirement obligations |  | $ | 235,265 |  |  | $ | 307,269 |
(a) The nine months ended September 30, 2019 represents the completion of the sale of approximately 1,300 shallow, non-core wells in Pennsylvania.

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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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