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PRINCIPAL ACCOUNTING POLICIES (Details 10) | 12 Months Ended
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Dec. 31, 2013 USD ($) | Dec. 31, 2013 CNY | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2013 23.00-34.99 USD ($) | Dec. 31, 2013 35.00-44.99 USD ($) | Dec. 31, 2013 45.00-58.99 USD ($) | Dec. 31, 2013 59.00-77.99 USD ($) | Dec. 31, 2013 78.00-96.99 USD ($) | Dec. 31, 2013 97.00-129.99 USD ($) | Dec. 31, 2013 130.00-159.99 USD ($)
Share-based compensation disclosures by exercise price range |  |  |  |  |  |  |  |  |  |  |
Number of shares, outstanding | 4,130,732 | 4,130,732 |  |  | 1,125 | 1,353,069 | 157,558 | 1,358,411 | 731,131 | 466,500 | 62,938
Weighted-average exercise price, outstanding (in dollars per share) |  |  |  |  | $ 30.50 | $ 38.06 | $ 58.39 | $ 76.78 | $ 91.36 | $ 106.12 | $ 151.78
Weighted-average remaining contractual life (years), outstanding |  |  |  |  | 1 month 13 days | 3 years 29 days | 1 year 1 month 13 days | 6 years 11 months 23 days | 5 years 2 months 26 days | 5 years 7 months 10 days | 5 years 2 months 1 day
Number of shares, exercisable | 2,283,785 | 2,283,785 |  |  | 1,125 | 1,353,069 | 157,558 | 98,324 | 374,298 | 257,333 | 42,078
Weighted-average exercise price, exercisable (in dollars per share) |  |  |  |  | $ 30.50 | $ 38.06 | $ 58.39 | $ 70.69 | $ 94.61 | $ 108.79 | $ 150.76
Weighted-average remaining contractual life (years), exercisable |  |  |  |  | 1 month 13 days | 3 years 29 days | 1 year 1 month 13 days | 6 years 5 months 5 days | 4 years 3 months 11 days | 5 years 4 months 24 days | 5 years 1 month 6 days
Assumptions |  |  |  |  |  |  |  |  |  |  |
Weighted average fair value of options granted (in dollars per share) | $ 38.40 |  | $ 38.01 | $ 64.79 |  |  |  |  |  |  |
Total unrecognized compensation cost | $ 78,000,000 |  |  |  |  |  |  |  |  |  |
Weighted average recognized period | 2 years 7 months 6 days | 2 years 7 months 6 days |  |  |  |  |  |  |  |  |
Total cash received from the exercise of share options | $ 30,000,000 | 180,261,090 |  |  |  |  |  |  |  |  |

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- Definition Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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