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East Tennessee Materials and Energy Corporation (''M&EC'') (Tables) | 3 Months Ended
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Mar. 31, 2019
Discontinued Operations and Disposal Groups [Abstract] |
Schedule of Change in Asset Retirement Obligation | The following reflects changes to the closure liabilities for the M&EC facility from year end 2018:
Amounts in thousands |  |  |
Balance as of December 31, 2018 |  | $ | 1,142 |
Adjustment to closure liability |  |  | 165 |
Spending |  |  | (1,026 | )
Balance as of March 31, 2019 |  | $ | 281 |

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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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