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Land use rights, 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 (¥)
Amortization of acquired intangible assets and land use right ¥ 69,095 $ 10,049 ¥ 62,419 ¥ 100,892
Use Rights [Member]        
Amortization of acquired intangible assets and land use right ¥ 48,100   ¥ 47,909 ¥ 43,915