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Income tax (Schedule of Net Operating Tax Loss Carry Forwards) (Details)
¥ in Thousands
Dec. 31, 2016
CNY (¥)
Net operating tax loss carry forwards [Line Items]  
Operating tax loss carry forwards ¥ 295,238
2017 [Member]  
Net operating tax loss carry forwards [Line Items]  
Operating tax loss carry forwards
2018 [Member]  
Net operating tax loss carry forwards [Line Items]  
Operating tax loss carry forwards 9,428
2019 [Member]  
Net operating tax loss carry forwards [Line Items]  
Operating tax loss carry forwards 28,373
2020 [Member]  
Net operating tax loss carry forwards [Line Items]  
Operating tax loss carry forwards 78,713
2021 [Member]  
Net operating tax loss carry forwards [Line Items]  
Operating tax loss carry forwards ¥ 178,724