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EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
EMPLOYEE BENEFIT PLANS      
Employer's contribution (as a percent)   20.00%  
Defined contributions schemes expense $ 6,189 $ 5,806 $ 4,740
Percentage of applicable salaries contributed by the employer for medical insurance benefits 10.00%    
Percentage of applicable salaries contributed by the employer for housing funds 8.00%    
Percentage of applicable salaries contributed by the employer for unemployment benefits 2.00%    
Percentage of applicable salaries contributed by the employer for other statutory benefits 2.00%    
Amount of contribution by the employer for medical insurance benefits, housing funds, unemployment and other statutory benefits $ 8,193 $ 5,980 $ 5,461