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Divestments and Investments (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 10 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 22, 2018
Business Acquisition [Line Items] |  |  |  |  |  |
Net gain on divestiture of minority interest |  |  | $ 7,908 | $ (788) |  |
Operating expenses |  |  | 334,071 | $ 353,300 | $ 404,019 |
Equity method investments made during the period |  |  | 5,200 |  |  |
LPW Technology [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Total consideration from divestiture of minority interest |  |  | 33,600 |  |  |
Total cash received upon closing from divestiture of minority interest |  |  | 30,300 |  |  |
Net gain on divestiture of minority interest |  |  | $ 13,500 |  |  |
Ownership percentage |  |  |  |  |  | 40.00%
Solidscape, Inc [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Net gain on divestiture of minority interest | $ 7,000 |  |  |  |  |
Evolve Research and Development Project [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Operating expenses |  | $ 1,600 |  |  |  |
Write-off of in-process research and development project |  | $ 5,000 |  |  |  |

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