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Divestments and Investments (Schedule of Financial Data for Equity Minority Interests Divested) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Oct. 22, 2018
Noncontrolling Interest [Line Items]        
Current assets $ 30,182      
Non-current assets 5,337      
Total assets 35,519      
Current liabilities 3,434      
Non-current liabilities 28      
Total liabilities 3,462      
Net loss for the year ended 11,306      
LPW Technology [Member]        
Noncontrolling Interest [Line Items]        
Current assets   $ 18,512   $ 10,682
Non-current assets   6,257   16,571
Total assets   24,769   27,253
Current liabilities   5,751   7,600
Non-current liabilities   1,401   4,930
Total liabilities   7,152   $ 12,530
Net loss for the year ended $ 4,600 $ 1,800 $ 500