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RESTRICTED NET ASSETS (Narrative) (Details) - 12 months ended Dec. 31, 2018
¥ in Thousands, $ in Thousands
CNY (¥)
USD ($)
Restricted Net Assets [Line Items]    
Percentage of after-tax profit to general reserve 10.00%  
Amount of net assets restricted ¥ 3,790,974 $ 551,374
Foreign Tax Authority [Member]    
Restricted Net Assets [Line Items]    
Percentage of after-tax profit to general reserve 10.00%  
Percentage of general reserve registered capital 50.00%  
Domestic Tax Authority [Member]    
Restricted Net Assets [Line Items]    
Percentage of after-tax profit to general reserve 10.00%  
Percentage of general reserve registered capital 50.00%