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East Tennessee Materials and Energy Corporation (M&EC) - Schedule of Change in Asset Retirement Obligation (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Asset Retirement Obligation Disclosure [Abstract]
Balance as of December 31, 2017	$ 2,791
Accretion expense	19
Adjustment to closure liabilities	2,308
Payments	(4,079)
Balance as of September 30, 2018	$ 1,039

X

- Definition

The amount of estimated costs accrued as of the balance sheet date to comply with regulatory requirements pertaining to the retirement of a waste management facility (such as a landfill or waste treatment facility). Represents the portion that will be paid within one year or the normal operating cycle, if longer.

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X

- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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No definition available.

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- Definition

Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

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Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

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