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Property, plant and equipment - Right-of-use Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets $ 12,206 $ 12,774
Property    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets 11,837 12,537
Equipment    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets 139 121
Vehicle    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets $ 230 $ 116