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Summary of significant accounting policies - Initial Measurement of Lease Liability (Details) - USD ($)
$ in Thousands
Jan. 01, 2019
Dec. 31, 2018
Corporate Information and Statement of IFRS Compliance [Abstract]    
Operating lease commitments disclosed as of December 31, 2018 $ 9,508  
Finance leases 595 $ 595
(Less): short-term leases not recognised as a liability (9,308)  
Add: adjustments as a result of a different treatment 199,929  
Add: adjustments relating to changes in the index or rate affecting variable payments 4,213  
Initial recognition of lease liability $ 204,937