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EMPLOYEE BENEFITS OBLIGATIONS (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
EMPLOYEE BENEFITS OBLIGATIONS [abstract]      
Provisions for employee benefits ¥ 30,745 ¥ 34,043 ¥ 13,380
Less: current portion included in accruals and other payables (30,745) (34,043)  
Noncurrent provisions for employee benefits ¥ 0 ¥ 0