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Concentration of Risks (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Concentration Risk        
Total costs $ 422,551 ¥ 2,905,249 ¥ 722,830 ¥ 577,870
Minimum number of years for economic reform policies pursuing by PRC government 20 years 20 years    
Percentage of appreciation (depreciation) of US dollar against RMB 5.00% 5.00% (5.80%) 6.80%
Business supplier risk | Total cost | Supplier A        
Concentration Risk        
Total costs   ¥ 550,832    
Business supplier risk | Total cost | Supplier B        
Concentration Risk        
Total costs   ¥ 491,798 ¥ 459,982  
Business supplier risk | Total cost | Supplier C        
Concentration Risk        
Total costs     ¥ 81,009