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Taxation (Movement of Valuation Allowance for Net Deferred Tax Assets) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]      
Beginning balance $ 326,755 $ 283,711 $ 250,524
Provision for the year 45,787 36,363 44,634
Reversal for the year (91,019) (12,637) (7,311)
Foreign currency translation adjustment 7,574 19,318 (4,136)
Ending balance $ 289,097 $ 326,755 $ 283,711