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Bank borrowings - (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Feb. 22, 2019
Feb. 28, 2018
Dec. 31, 2017
Borrowings [abstract]        
Non-Current Amount $ 132,821      
Current Amount 8,191     $ 1,003
Principal amount 135,919      
Total 141,012     1,003
Amount due for settlement after 12 months 132,821      
Credit facilities        
Borrowings [abstract]        
Principal amount 250,000     200,000
Non-Current Amount 132,821      
Current Amount 493      
Principal amount 135,919      
Unamortised issuance costs (3,098)      
Accrued interest 493      
Total 133,314     0
Amount due for settlement within 12 months 493      
Amount due for settlement after 12 months 132,821      
Other        
Borrowings [abstract]        
Current Amount 7,698     1,003
Total $ 7,698     $ 1,003
Revolving Credit Facility        
Borrowings [abstract]        
Principal amount   $ 200,000 $ 250,000