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Business Segment Information - Segment Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Assets:	$ 160,183	$ 173,799
Equity method investments	30,312	39,155
Operating Segments
Segment Reporting Information [Line Items]
Assets:	112,479	124,865
Operating Segments | Refined Coal
Segment Reporting Information [Line Items]
Assets:	33,940	43,953
Operating Segments | Power Generation and Industrials
Segment Reporting Information [Line Items]
Assets:	78,539	80,912
All Other and Corporate
Segment Reporting Information [Line Items]
Assets:	$ 47,704	$ 48,934

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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