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Land use rights, net (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2013
CNY (¥)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CNY (¥)
Land use rights, net          
Land use rights   ¥ 1,108,125     ¥ 1,999,424
Less: Accumulated amortization   (40,872)     (71,232)
Net book value   1,067,253   $ 297,662 1,928,192
Amortization expenses ¥ 30,360 ¥ 19,342 ¥ 11,700    
Amortization expenses related to the land use rights for future periods          
2016         40,802
2017         40,802
2018         40,802
2019         40,802
2020         40,802
2021 and thereafter         ¥ 1,724,182