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Assets Held for Sale - Schedule of Assets Classified as Held for Sale (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 10, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Loss on write-down of assets held for sale |  | $ 0 |  | $ 0 | $ (2,580) | $ 0 |
Proceeds from sales of businesses |  |  |  |  | $ 1,665 | $ 18,490 |
Energy Chemistry Technologies | Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Loss on write-down of assets held for sale |  |  | $ 2,600 |  |  |  |
Property and equipment, net |  |  |  |  |  |  | $ 4,998
Valuation allowance |  |  |  |  |  |  | 0
Assets held for sale, net |  |  |  |  |  |  | $ 4,998
Energy Chemistry Technologies | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from sales of businesses | $ 1,800 |  |  |  |  |  |
Gain (loss) on sale of business |  | $ (400) |  |  |  |  |

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