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Financial risk management - Summary of Capital Risk Management (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about financial instruments [abstract]        
Total debt $ 862,116 $ 817,958 $ 635,396  
Total equity 1,108,145 683,019 [1],[2] $ 712,304 [2],[3] $ 564,150
TOTAL SHAREHOLDERS EQUITY AND LIABILITIES $ 1,970,261 $ 1,500,977    
Gearing ratio 44.00% 54.00%    
[1] 2017 information has been recast to reflect the Company's change in accounting policy for Investment properties as described in Note 33.
[2] Prior periods have been recast to reflect the Company's change in accounting policy for Investment properties as in Note 33.
[3] 2016 information has been recast to reflect the Company's change in accounting policy for Investment properties as described in Note 33.