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Short-term deposits (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2015 CNY (¥) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 CNY (¥) | Dec. 31, 2014 USD ($)
--- | --- | --- | --- | ---
Short-term deposits |  |  |  |
Short-term deposits | ¥ 1,894,946 | $ 292,529 | ¥ 4,214,576 |
RMB [Member] |  |  |  |
Short-term deposits |  |  |  |
Short-term deposits | 250,000 |  | 1,921,520 |
US$ [Member] |  |  |  |
Short-term deposits |  |  |  |
Short-term deposits | ¥ 1,644,946 | $ 253,322 | ¥ 2,293,056 | $ 374,685

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- Definition Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 + Details
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