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Taxation - Provision for Consolidated Income Tax (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes [Abstract]      
Current income tax $ (2,840) $ 666 $ (2,846)
Deferred income tax (9,485) (21,486) 3,870
Income tax (expense) / benefit $ (12,325) $ (20,820) [1] $ 1,024 [1]
[1] Prior periods have been recast to reflect the Company's change in accounting policy for the reclassification within financial results as explained in Note 34.1.