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Lease liabilities - Summary (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Lease liabilities        
Non-current $ 159,435 $ 174,570 [1]    
Current 36,337 41,814 [1]    
Lease liabilities $ 195,772 $ 216,384 $ 178,143 $ 0
[1] Prior periods have been recast to reflect the Company's change in accounting policy for the reclassification within shareholders equity of the initial application of IAS 29 as explained in Note 34.1.