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Fair Value Measurements (Financial instruments measured at fair value by level within the fair value hierarchy) (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
CNY (¥)
Assets:      
Term deposits and short term investments ¥ 781,298   ¥ 769,681
Restricted cash 354,602   125,000
Available-for-sale investments 939,432 $ 135,306 513,994
Quote Prices in Active Market for Identical Assets (Level 1) [Member]      
Assets:      
Term deposits and short term investments 22,198   106,907
Restricted cash 354,602   125,000
Significant Other Observable Inputs (Level 2) [Member]      
Assets:      
Term deposits and short term investments 759,100   662,774
Significant Unobservable Inputs (Level 3) [Member]      
Assets:      
Available-for-sale investments ¥ 939,432   ¥ 513,994