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Taxation (Tax Holiday Effect) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]      
Tax holiday effect $ 1,635 $ 16,174 $ 7,981
Basic net income per share effect $ 0.04 $ 0.41 $ 0.20