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Acquisition and disposal related costs Acquisition and disposal related costs (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Sep. 29, 2019 | Sep. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Acquistion & Disposal Related Costs | $ 0 |  |  | $ 0 | $ 1,700,000 | $ 0
Acquisition termination payment |  |  | $ 4,600,000 |  |  |
Magnesium Elektron CZ s.r.o. |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Net profit on disposal |  | $ 2,900,000 |  |  |  |
Disposed of by Sale | Magnesium Elektron CZ s.r.o. |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Cash proceeds |  |  |  |  | 5,900,000 |
Cash held in business | (1,300,000) |  |  |  | (1,300,000) |
Purchase price adjustment | (200,000) |  |  |  | (200,000) |
Net proceeds |  |  |  |  | 4,400,000 |
Net assets less cash | $ (3,600,000) |  |  |  | (3,600,000) |
Profit on disposal |  |  |  |  | 800,000 |
Disposal costs |  |  |  |  | (400,000) |
Realized translation gain on disposal |  |  |  |  | 2,500,000 |
Net profit on disposal |  |  |  |  | $ 2,900,000 |

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