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Taxation - Deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax assets $ 16,191 $ 30,808 [1] $ 25,043 [1]
Deferred income tax liabilities (168,171) (10,457) [1] (14,689) [1]
Deferred tax liability (asset) (151,980) 20,351 10,354
Deferred tax assets temporary differences      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax assets 138,851 118,183 114,326
Deferred tax liability temporary differences      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax liabilities (290,831) (97,832) $ (103,972)
Recovered after more than 12 months | Deferred tax assets temporary differences      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax assets 76,225 97,992  
Recovered after more than 12 months | Deferred tax liability temporary differences      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax liabilities (289,158) (91,742)  
Recovered within 12 months | Deferred tax assets temporary differences      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax assets 62,626 20,191  
Recovered within 12 months | Deferred tax liability temporary differences      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax liabilities $ (1,673) $ (6,090)  
[1] Prior periods have been recast to reflect the Company's change in accounting policy for Investment properties as in Note 33.