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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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