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Cash and cash equivalents (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
 [1],[2]
Dec. 31, 2015
 [1]
Cash and cash equivalents [abstract]        
Cash at bank and on hand $ 197,544 $ 118,358    
Short-term bank deposits 76,091 150,837    
Cash and cash equivalents $ 273,635 $ 269,195 [1],[2] $ 158,568 $ 198,894
[1] Prior periods have 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.