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Restricted cash (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Restricted cash        
Restricted cash $ 422,428 ¥ 2,940,859 ¥ 3,239,613 ¥ 4,110,210