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Asset Retirement Obligations (Tables) | 6 Months Ended
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Jun. 30, 2020
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, 2020 and the year ended December 31, 2019 is as follows (in thousands):
|  | Six Months Ended June 30, 2020 |  |  | Year Ended December 31, 2019 |
Beginning of period |  | $ | 251,076 |  |  | $ | 312,754 |
Liabilities incurred |  |  | 1,618 |  |  |  | 4,063 |
Acquisitions |  |  | 123 |  |  |  | — |
Liabilities settled |  |  | (1,416 | ) |  |  | (5,953 | )
Disposition of wells (a) |  |  | (126,268 | ) |  |  | (82,576 | )
Accretion expense |  |  | 4,729 |  |  |  | 15,658 |
Change in estimate |  |  | 2,507 |  |  |  | 7,130 |
End of period |  |  | 132,369 |  |  |  | 251,076 |
Less current portion |  |  | (2,393 | ) |  |  | (2,393 | )
Long-term asset retirement obligations |  | $ | 129,976 |  |  | $ | 248,683 |
(a) The six months ended June 30, 2020 primarily represents the completion of the sale of our shallow legacy assets in Northwest 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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