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Land use rights, net (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Land use rights, net        
Land use rights, cost   ¥ 4,053,855 ¥ 3,174,446  
Less: accumulated amortization   (168,277) (96,676)  
Land use rights, net   3,885,578 3,077,770  
Amortization expenses for land use rights $ 10,414 ¥ 71,601 ¥ 55,545 ¥ 37,657