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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 to the Company's Before-tax Asset Retirement Obligation | The following table indicates the changes to the company’s before-tax asset retirement obligations in 2020, 2019 and 2018:
| 2020 |  |  | 2019 |  | 2018
Balance at January 1 | $ | 12,832 |  |  |  | $ | 14,050 |  |  | $ | 14,214 |
Liabilities assumed in the Noble acquisition | 630 |  |  |  | — |  |  | — |
Liabilities incurred | 10 |  |  |  | 32 |  |  | 96 |
Liabilities settled | (1,661) |  |  |  | (1,694) |  |  | (830) |
Accretion expense | 560 |  |  |  | 628 |  |  | 654 |
Revisions in estimated cash flows | 1,245 |  |  |  | (184) |  |  | (84) |
Balance at December 31 | $ | 13,616 |  |  |  | $ | 12,832 |  |  | $ | 14,050 |

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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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