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Accrued Closure Costs and ARO (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 2018 and 2017, were as follows:
Amounts in thousands |  |  |
Balance as of December 31, 2016 |  | $ | 7,315 |
Accretion expense |  |  | 460 |
Spending |  |  | (2,037 | )
Adjustment to closure liability |  |  | 2,657 |
Balance as of December 31, 2017 |  |  | 8,395 |
Accretion expense |  |  | 325 |
Spending |  |  | (5,293 | )
Adjustment to closure liability |  |  | 3,323 |
Balance as of December 31, 2018 |  | $ | 6,750 |
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, 2018 and 2017 with the following activity for the years ended December 31, 2018 and 2017:
Amounts in thousands |  |  |
Balance as of December 31, 2016 |  | $ | 4,148 |
Amortization of closure and post-closure asset |  |  | (1,071 | )
Impairment of closure and post-closure asset |  |  | (413 | )
Adjustment to closure and post-closure asset |  |  | 1,257 |
Balance as of December 31, 2017 |  |  | 3,921 |
Amortization of closure and post-closure asset |  |  | (191 | )
Balance as of December 31, 2018 |  | $ | 3,730 |

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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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