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East Tennessee Materials and Energy Corporation (“M&EC”) (Tables) | 3 Months Ended
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Mar. 31, 2018
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Change in Asset Retirement Obligation | The following reflects changes to the closure liabilities for the M&EC facility from year end 2017:
Amounts in thousands |  |  |
Balance as of December 31, 2017 |  | $ | 2,791 |
Accretion expense |  |  | 19 |
Payments |  |  | (946 | )
Balance as of March 31, 2018 |  | $ | 1,864 |

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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://www.xbrl.org/2003/role/presentationRef -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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