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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

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- Definition

Fair value of restricted cash

+ References

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- Definition

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+ References

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- Definition

Equity securities categorized neither as held-to-maturity nor trading which are intended be sold more than one year from the balance sheet date or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26626-111562

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