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Asset Retirement Obligations | 9 Months Ended
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Sep. 30, 2019
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligations | Asset Retirement Obligations Activity related to the Company’s asset retirement obligations is as follows:
(In thousands) |  | Nine Months Ended September 30, 2019
Balance at beginning of period(1) |  | $ | 51,622 |
Liabilities incurred |  | 4,776 |
Liabilities settled |  | (1,232 | )
Liabilities divested |  | (187 | )
Accretion expense |  | 2,489 |
Balance at end of period(2) |  | $ | 57,468 |
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(1) | Includes $1.0 million of current asset retirement obligations included in accrued liabilities at December 31, 2018.
(2) Includes $0.5 million of current asset retirement obligations included in accrued liabilities at September 30, 2019.

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2175671 + Details
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