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TAXATION (Summary of Amounts and Expiration Dates of Operating Loss Carryforward) (Details)
¥ in Thousands
Dec. 31, 2018
CNY (¥)
Operating Loss Carryforwards [Line Items]  
Operating loss carryforward ¥ 1,016,203
2019  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforward 151,768
2020  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforward 83,692
2021  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforward 59,575
2022  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforward 31,845
2023 and thereafter  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforward ¥ 689,323