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Other operating income (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Other operating income.        
Government grants   ¥ 553,153 ¥ 347,817 ¥ 282,866
Claims income   101,778 68,993 65,368
Others   66,044 34,130 9,795
ADR reimbursement   36,087 80,115  
Total other operating income $ 110,110 ¥ 757,062 ¥ 531,055 ¥ 358,029