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Income tax (Schedule of Components of Income Tax) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Income tax [Abstract]      
Current tax $ (111,371) $ (101,456) $ (48,449)
Deferred income tax (Note 18) (391) (4,784) 5,304
Tax expense (income), continuing operations $ (111,762) $ (106,240) $ (43,145)