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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Details 6) - Prepayments to suppliers - Supplier - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Supplier A    
Concentration of credit risk    
Advances to suppliers $ 18,260 $ 16,268
Supplier B    
Concentration of credit risk    
Advances to suppliers $ 9,086 $ 10,459