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PROPERTY AND EQUIPMENT, NET (Schedule of Property and Equipment) (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Property and equipment ¥ 635,864 ¥ 275,021
Less: accumulated depreciation (198,527) (147,157)
Property and equipment, net 437,337 127,864
Office Building [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 281,541
Furniture [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 18,078 10,510
Office equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 271,862 211,385
Leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment ¥ 64,383 ¥ 53,126