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PRINCIPAL ACCOUNTING POLICIES (Details 15) | 0 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 13, 2012 USD ($) | Sep. 29, 2011 USD ($) | Sep. 30, 2008 USD ($) | Jul. 30, 2008 USD ($) | Dec. 31, 2013 USD ($) item | Dec. 31, 2013 CNY item | Dec. 31, 2012 CNY | Dec. 31, 2011 CNY | Oct. 31, 2013 2012 Convertible Senior Notes USD ($) | Dec. 31, 2013 ADS USD ($) item | Oct. 31, 2013 ADS 2012 Convertible Senior Notes USD ($)
Treasury stock disclosures |  |  |  |  |  |  |  |  |  |  |
Approved repurchase plan | $ 300,000,000 | $ 100,000,000 | $ 15,000,000 | $ 15,000,000 |  |  |  |  |  |  |
Number of share repurchase plans |  |  |  |  |  |  |  |  |  | 3 |
Number of shares repurchased |  |  |  |  |  |  |  |  |  | 3,777,087 |
Cost of repurchased shares |  |  |  |  |  |  | 1,733,127,675 | 158,761,225 |  | 256,000,000 |
Early conversion of convertible notes |  |  |  |  |  |  |  |  | 45,500,000 |  | 45,500,000
Stock issued to bond holders |  |  |  |  |  |  |  |  | 588,219 |  |
Treasury stock, shares |  |  |  |  | 3,777,087 | 3,777,087 | 4,365,306 |  |  |  |
Treasury stock at cost |  |  |  |  | $ 256,230,284 | 1,551,141,268 | 1,891,888,900 |  |  |  |
Segment reporting disclosures |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments |  |  |  |  | 1 | 1 |  |  |  |  |

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- Definition Number of shares issued during the period as a result of the conversion of convertible securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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