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Restricted Net Assets (Narrative) (Details) - Company's subsidiaries, VIEs and subsidiaries of VIEs incorporated in PRC [Member]
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
CNY (¥)
Schedule of Restricted Net Assets [Line Items]      
Portion of after-tax profit to be allocated to general reserve fund under PRC law (as a percent) 10.00%    
Required general reserve/registered capital ratio to de-force compulsory net profit allocation to general reserve (as a percent) 50.00%    
Restricted net assets ¥ 551.8 $ 79.5 ¥ 549.9