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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2019 and 2018 (in thousands):
| 2019 |  |  | 2018 |
Beginning of period | $ | 312,754 |  |  | $ | 276,855 |
Liabilities incurred |  | 4,063 |  |  |  | 3,376 |
Acquisitions |  | — |  |  |  | 13,438 |
Liabilities settled |  | (5,953 | ) |  |  | (5,052 | )
Disposition of wells |  | (82,576 | ) |  |  | (13,332 | )
Accretion expense |  | 15,658 |  |  |  | 25,456 |
Change in estimate |  | 7,130 |  |  |  | 12,013 |
End of period |  | 251,076 |  |  |  | 312,754 |
Less current portion |  | (2,393 | ) |  |  | (5,485 | )
Long-term asset retirement obligations (a) | $ | 248,683 |  |  | $ | 307,269 |
(a) In fourth quarter 2019, we entered into an agreement to sell our legacy assets in Northwest Pennsylvania. Final approval from the state governmental authorities for a change in operatorship is expected by mid-2020, at which time we will reduce this liability by approximately $125.5 million and recognize a gain on sale of these assets.

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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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