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Assets Held for Sale - Schedule of Assets Classified as Held for Sale (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 10, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Loss on write-down of assets held for sale |  |  |  | $ (2,580) | $ 0 | $ 0
Assets held for sale |  |  |  | 118,470 | 121,218 |
Proceeds from sale of businesses |  |  |  | $ 1,665 | 18,490 | $ 0
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 |  |  |  |  | $ 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 sale of businesses | $ 1,800 |  |  |  |  |
Gain (loss) on sale of business |  | $ 400 |  |  |  |

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