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Property and equipment, net (Narrative) (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Depreciation expense ¥ 150,991 $ 21,961 ¥ 176,715 ¥ 173,625