Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Divestments and Investments (Narrative) (Details)

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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