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Related-party transactions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Entities with joint control or significant influence over entity      
Disclosure of transactions between related parties [line items]      
Cost of manufactured products sold and services rendered $ (2,279) $ (3,326) $ (42)
Other related parties      
Disclosure of transactions between related parties [line items]      
Receivables from related parties 324 176  
Payables (160) (367)  
Directors and senior management      
Disclosure of transactions between related parties [line items]      
Payables (16,353) (17,985)  
Compensation selected employees (7,122) (7,040) (5,213)
Joint ventures      
Disclosure of transactions between related parties [line items]      
Receivables from related parties 8,337 10,218  
Payables (194) (261)  
Sales of goods 456 2,487 372
Services 210 88 87
Interest income 242 $ 308 $ 326
Related party loan $ 8,000    
Borrowings, interest rate 3.00%