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The Nature of Expenses - Employee benefits expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
The Nature of Expenses      
Salary $ 125,813 $ 142,564 $ 126,976
Labor and health insurance 7,548 7,421 7,232
Pension 6,588 6,527 5,993
Others 6,545 6,431 6,608
Total compensation $ 146,494 $ 162,943 $ 146,809