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Land use rights, net (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
CNY (¥)
Land use rights, net          
Land use rights   ¥ 1,999,424     ¥ 2,567,271
Less: Accumulated amortization   (71,232)     (119,760)
Net book value   1,928,192   $ 352,515 2,447,511
Amortization expenses ¥ 48,528 ¥ 30,360 ¥ 19,342    
Amortization expenses related to the land use rights for future periods          
2017         52,329
2018         52,329
2019         52,329
2020         52,329
2021         52,329
2022 and thereafter         ¥ 2,185,866