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Property, plant and equipment (Parenthetical) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Disclosure of detailed information about property, plant and equipment [line items]        
Right-of-use assets $ 8,066     $ 45,115
Depreciation of Right-of-use Assets (IFRS 16) (5,450) $ 0 $ 0  
Buildings [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Right-of-use assets 25,742      
Depreciation of Right-of-use Assets (IFRS 16) (3,547)      
Buildings [member] | Gross carrying amount [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Right-of-use assets 29,289      
Vehicles [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Right-of-use assets 3,356      
Depreciation of Right-of-use Assets (IFRS 16) (537)      
Vehicles [Member] | Gross carrying amount [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Right-of-use assets 3,893      
Machinery [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Right-of-use assets 8,066      
Depreciation of Right-of-use Assets (IFRS 16) (3,867)      
Machinery [member] | Gross carrying amount [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Right-of-use assets 11,933      
Property, Plant and Equipment [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Right-of-use assets 37,164      
Depreciation of Right-of-use Assets (IFRS 16) (7,951)      
Property, Plant and Equipment [Member] | Gross carrying amount [member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Right-of-use assets $ 45,115