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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2019
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):
| 2019 |  | 2018 |  | 2017
Asset retirement obligation at beginning of year | $ | 18,266 |  |  | $ | 17,482 |  |  | $ | 15,515 |
Liabilities incurred | 2,699 |  |  | — |  |  | 1,171 |
Liabilities settled | (1,503 | ) |  | (66 | ) |  | — |
Accretion expense | 876 |  |  | 850 |  |  | 796 |
Asset retirement obligation at end of year | $ | 20,338 |  |  | $ | 18,266 |  |  | $ | 17,482 |

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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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