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Financial risk management - Capital Risk Management (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [abstract]        
Total debt $ 971,090 $ 968,280 $ 862,116  
Total equity 963,724 1,028,883 [1] $ 1,108,145 [2] $ 891,197
Total capital $ 1,934,814 $ 1,997,163    
[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.
[2] Prior periods have been recast to reflect the Company's change in accounting policy for the classification of the adjustment of opening balance for the application of IAS 29 as explained in Note 34.