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Land use rights, net (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Land use rights, net          
Land use rights   ¥ 10,860,924 ¥ 7,254,974   ¥ 11,380,221
Less: accumulated amortization   (385,266) (204,165)   (488,479)
Net book value   10,475,658 7,050,809 $ 1,564,501 10,891,742
Amortization expenses ¥ 222,143 ¥ 181,101 ¥ 84,405    
Amortization expenses related to the land use rights for future periods          
2020         228,572
2021         228,572
2022         228,572
2023         228,572
2024         228,572
2025 and thereafter         ¥ 9,748,882