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Investment in equity investees (Details 1) - CNY (¥)
¥ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Cost method investments    
Carrying values of cost method investments ¥ 5,714,513 ¥ 3,308,127
Cost method investments 2,580,640 ¥ 2,856,500
Top investee one    
Cost method investments    
Cost method investments 1,298,700  
Top investee two    
Cost method investments    
Cost method investments ¥ 344,325