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Business Segment, Geographic and Major Customer Information (Assets by Reportable Segments) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Assets | $ 231,847 | $ 285,883
Held for sale | 0 | 118,470
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Assets | 231,847 | 167,413
Operating Segments | Energy Chemistry Technologies |  |
Segment Reporting Information [Line Items] |  |
Assets | 117,357 | 139,205
Corporate and Other |  |
Segment Reporting Information [Line Items] |  |
Assets | $ 114,490 | $ 28,208

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