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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 Change in Asset Retirement Obligation | A reconciliation of the Company's beginning and ending aggregate carrying amount of the asset retirement obligations are as follows:
|  | Coal Mining |  | NAMining |  | Unallocated Items |  | NACCO Consolidated
Balance at January 1, 2018 |  | $ | 22,589 |  |  | $ | 1,085 |  |  | $ | 16,423 |  |  | $ | 40,097 |
Liabilities incurred during the period |  | — |  |  | 189 |  |  | — |  |  | 189 |
Liabilities settled during the period |  | (920 | ) |  | — |  |  | (747 | ) |  | (1,667 | )
Accretion expense |  | 1,504 |  |  | 31 |  |  | 1,044 |  |  | 2,579 |
Revision of estimated cash flows |  | (2,777 | ) |  | (820 | ) |  | 102 |  |  | (3,495 | )
Balance at December 31, 2018 |  | $ | 20,396 |  |  | $ | 485 |  |  | $ | 16,822 |  |  | $ | 37,703 |
Liabilities incurred during the period |  | — |  |  | 91 |  |  | — |  |  | 91 |
Liabilities settled during the period |  | (8,265 | ) |  | — |  |  | (752 | ) |  | (9,017 | )
Accretion expense |  | 1,260 |  |  | 28 |  |  | 1,323 |  |  | 2,611 |
Revision of estimated cash flows at MLMC |  | 3,145 |  |  | — |  |  | — |  |  | 3,145 |
Revision of estimated cash flows at Centennial |  | 2,479 |  |  | — |  |  | (153 | ) |  | 2,326 |
Balance at December 31, 2019 |  | $ | 19,015 |  |  | $ | 604 |  |  | $ | 17,240 |  |  | $ | 36,859 |

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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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