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The Nature of Expenses - Employee benefits expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
The Nature of Expenses      
Salary $ 88,149 $ 80,617 $ 91,822
Labor and health insurance 5,805 5,668 6,054
Pension 4,536 5,246 5,474
Others 4,867 3,586 3,576
Employee benefits expense $ 103,357 $ 95,117 $ 106,926