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Asset Retirement Obligations | 12 Months Ended
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Dec. 31, 2021
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligations | Asset Retirement Obligations The table below summarizes the changes in our recorded asset retirement obligations (in thousands):
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Beginning balance | $ | 10,636 |  |  | $ | 10,180 |  |  | $ | 9,985 |
Accretion expense | 873 |  |  | 490 |  |  | 331 |
Revision in estimate | 3,602 |  |  | — |  |  | — |
Liabilities settled during period | (697) |  |  | (34) |  |  | (136) |
Ending balance | $ | 14,414 |  |  | $ | 10,636 |  |  | $ | 10,180 |

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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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