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Income tax (Schedule of Components of Income Tax) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Income tax [Abstract]      
Current income tax charge $ (49,291) $ (41,927) $ (111,371)
Deferred income tax charge (Note 18) (17,980) (5,936) (391)
Income tax $ (67,271) $ (47,863) $ (111,762)