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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Employer's contribution (as a percent) 16.00%    
Defined contributions schemes expense $ 8,064 $ 11,738 $ 12,544
Percentage of applicable salaries contributed by the employer for housing funds 8.00%    
Amount of contribution by the employer for medical insurance benefits, housing funds, unemployment and other statutory benefits $ 11,486 $ 11,409 $ 11,211
Minimum      
Percentage of applicable salaries contributed by the employer for medical insurance benefits 6.00%    
Percentage of applicable salaries contributed by the employer for unemployment benefits 0.50%    
Percentage of applicable salaries contributed by the employer for other statutory benefits 0.90%    
Maximum      
Percentage of applicable salaries contributed by the employer for medical insurance benefits 8.50%    
Percentage of applicable salaries contributed by the employer for unemployment benefits 0.70%    
Percentage of applicable salaries contributed by the employer for other statutory benefits 2.50%