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The Nature of Expenses - Employee benefits expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
The Nature of Expenses      
Salary $ 142,564 $ 126,976 $ 88,149
Labor and health insurance 7,421 7,232 5,805
Pension 6,527 5,993 4,536
Others 6,431 6,608 4,867
Total compensation recognized in income $ 162,943 $ 146,809 $ 103,357