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Taxation - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax assets $ 13,664 $ 16,191  
Deferred income tax liabilities (165,508) (168,171)  
Deferred tax liability (asset) (151,844) (151,980) $ 20,351
Deferred tax assets temporary differences      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax assets 144,267 136,431 118,183
Deferred tax liability temporary differences      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax liabilities (296,111) (288,411) $ (97,832)
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 108,294 73,805  
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 (292,871) (286,738)  
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 35,973 62,626  
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 $ (3,240) $ (1,673)