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Property, Plant and Equipment - Right-of-use assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Disclosure of initial application of standards or interpretations [line items]      
Right-of-use assets   $ 5,899  
Lease liabilities $ 4,220 $ 5,899 $ 0
Weighted-average rate applied 2.45%    
IFRS 16      
Disclosure of initial application of standards or interpretations [line items]      
Right-of-use assets $ 5,899    
Lease liabilities 5,899    
Addition to right-of use assets 246    
Depreciation expense of right-of use assets 2,018    
IFRS 16 | Offices and Buildings [Member]      
Disclosure of initial application of standards or interpretations [line items]      
Right-of-use assets $ 4,115