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Share based compensation (Restricted Shares - Narrative) (Details) - CNY (¥)
¥ in Thousands
12 Months Ended 72 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Share-based Compensation Award, Tranche Two [Member]        
Share-based compensation [Line Items]        
Number of equal installments in which award will vest 2      
Restricted shares [Member]        
Share-based compensation [Line Items]        
Share-based compensation (benefit) ¥ 0 ¥ 0 ¥ 3,771  
Restricted shares [Member] | Share-based Compensation Award, Tranche One [Member]        
Share-based compensation [Line Items]        
Vesting period 24 months      
Vesting rate 50.00%      
Restricted shares [Member] | Share-based Compensation Award, Tranche Two [Member]        
Share-based compensation [Line Items]        
Vesting period 24 months      
Vesting rate 50.00%      
Restricted shares [Member] | Maximum [Member]        
Share-based compensation [Line Items]        
Period from receipt of the notification to deliver a properly signed agreement after which service vested shares held by leaving employee shall automatically lapse and expire 30 days      
Duowan Entertainment Corporation [Member] | Non Employee [Member]        
Share-based compensation [Line Items]        
Granted (in shares)       100,000
Duowan Entertainment Corporation [Member] | Employees [Member]        
Share-based compensation [Line Items]        
Granted (in shares)       61,250,677