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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2020
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Changes in Asset Retirement Obligation | The following table documents the changes in the Company’s asset retirement obligation during the years ended December 31 (dollars in thousands):
|  | 2020 |  |  | 2019 |  |  | 2018 |
Asset retirement obligation at beginning of year |  | $ | 20,338 |  |  | $ | 18,266 |  |  | $ | 17,482 |
Liabilities incurred |  |  | (2,315 | ) |  |  | 2,699 |  |  |  | — |
Liabilities settled |  |  | (1,645 | ) |  |  | (1,503 | ) |  |  | (66 | )
Accretion expense |  |  | 816 |  |  |  | 876 |  |  |  | 850 |
Asset retirement obligation at end of year |  | $ | 17,194 |  |  | $ | 20,338 |  |  | $ | 18,266 |

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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