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Bank borrowings - Borrowing detail by currency - (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Borrowings [abstract]    
Non-Current Principal Amount $ 135,919  
Current Principal Amount 7,698 $ 1,003
Total 143,617 1,003
US Dollars    
Borrowings [abstract]    
Non-Current Principal Amount 78,664  
Current Principal Amount 785 992
Total 79,449 992
Euros    
Borrowings [abstract]    
Non-Current Principal Amount 57,255  
Current Principal Amount 6,913  
Total $ 64,168  
Other    
Borrowings [abstract]    
Current Principal Amount   11
Total   $ 11