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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