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Principal Accounting Policies (Statutory reserves) (Details)
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Schedule of Statutory Reserves [Line Items]        
Appropriations to statutory reserves ¥ 7.6 $ 1.1 ¥ 4.3 ¥ 15.6
Wholly foreign-owned enterprise [Member]        
Schedule of Statutory Reserves [Line Items]        
Portion of after-tax profit to be allocated to general reserve fund under PRC law (as a percent) 10.00% 10.00%    
Required general reserve/registered capital ratio to de-force compulsory net profit allocation to general reserve (as a percent) 50.00% 50.00%    
Domestically funded enterprises [Member]        
Schedule of Statutory Reserves [Line Items]        
Portion of after-tax profit to be allocated to general reserve fund under PRC law (as a percent) 10.00% 10.00%    
Required general reserve/registered capital ratio to de-force compulsory net profit allocation to general reserve (as a percent) 50.00% 50.00%