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Accrued Closure Costs and ARO (Tables) | 12 Months Ended
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Dec. 31, 2020
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Change in Asset Retirement Obligation | Changes to reported closure liabilities (current and long-term) for the years ended December 31, 2020 and 2019, were as follows:
Amounts in thousands |  |  |
Balance as of December 31, 2018 |  |  | 6,750 |
Accretion expense |  |  | 320 |
Spending |  |  | (1,359 | )
Adjustment to closure liability |  |  | 330 |
Balance as of December 31, 2019 |  | $ | 6,041 |
Accretion expense |  |  | 335 |
Spending |  |  | (11 | )
Balance as of December 31, 2020 |  | $ | 6,365 |
Schedule of Asset Retirement Obligations | The reported closure asset or ARO, is reported as a component of “Net Property and equipment” in the Consolidated Balance Sheets at December 31, 2020 and 2019 with the following activity for the years ended December 31, 2020 and 2019:
Amounts in thousands |  |  |
Balance as of December 31, 2018 |  |  | 3,730 |
Amortization of closure and post-closure asset |  |  | (191 | )
Balance as of December 31, 2019 |  | $ | 3,539 |
Amortization of closure and post-closure asset |  |  | (191 | )
Balance as of December 31, 2020 |  | $ | 3,348 |

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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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