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Short-term loans (Narrative) (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Restricted Cash and Investments, Current ¥ 0 $ 0 ¥ 1,000,000  
Loans Payable [Member]        
Debt Instrument, Face Amount     588,235 $ 90,000
Line of Credit Facility, Maximum Borrowing Capacity | $       $ 160,000
Restricted Cash and Investments, Current | ¥     ¥ 1,000,000  
Debt Instrument, Maturity Date, Description These loans were all with a maturity of less than one year      
Loans Payable [Member] | Minimum [Member]        
Debt Instrument, Interest Rate, Stated Percentage     2.00% 2.00%
Loans Payable [Member] | Maximum [Member]        
Debt Instrument, Interest Rate, Stated Percentage     3.00% 3.00%