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Related-party transactions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
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 $ 0 $ (42) $ (2,304)
Other related parties      
Disclosure of transactions between related parties [line items]      
Receivables from related parties 176 172  
Payables (367) (701)  
Directors and senior management      
Disclosure of transactions between related parties [line items]      
Payables (17,985) (17,355)  
Compensation selected employees (7,040) (5,213) (7,528)
Joint ventures      
Disclosure of transactions between related parties [line items]      
Receivables from related parties 10,218 8,114  
Payables (261) (451)  
Sales of goods 2,487 372 2,201
Services 88 87 110
Interest income 308 $ 326 $ 74
Related party loan $ 8,000    
Borrowings, interest rate 3.00%