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Taxation - Provision for consolidated income tax (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Abstract]      
Current income tax $ (2,846) $ (13,425) $ (21,505)
Deferred income tax 3,870 18,417 8,606
Income tax benefit / (expense) $ 1,024 $ 4,992 [1] $ (12,899) [1]
[1] Prior periods have been recast to reflect the Company's change in accounting policy for Investment properties as described in Note 33.