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Operating leases (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of finance lease and operating lease by lessee [line items]    
Payments under operating lease $ 17,770  
Less than 1 year    
Disclosure of finance lease and operating lease by lessee [line items]    
Payments under operating lease 2,335  
1-3 years    
Disclosure of finance lease and operating lease by lessee [line items]    
Payments under operating lease 4,436  
4-5 years    
Disclosure of finance lease and operating lease by lessee [line items]    
Payments under operating lease 4,148  
Thereafter    
Disclosure of finance lease and operating lease by lessee [line items]    
Payments under operating lease 6,851  
Facility as an operating lease    
Disclosure of finance lease and operating lease by lessee [line items]    
Lease and sublease payments recognised as expense $ 2,144 $ 2,107