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PRINCIPAL ACCOUNTING POLICIES - Summary of RSUs activities (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Weighted Average Exercise Price |  |  |
Outstanding, beginning (in dollars per share) | $ 157.82 | $ 122.00 | $ 101.03
Granted (in dollars per share) | 43.03 | 322.20 | 247.91
Exercised (in dollars per share) | 68.95 | 80.70 | 65.65
Forfeited (in dollars per share) | 133.92 | 199.32 | 156.32
Outstanding, ending (in dollars per share) | $ 168.80 | $ 157.82 | $ 122.00
Unrecognized compensation cost | $ 262.0 |  |
Weighted average recognized period | 2 years 8 months 12 days |  |
Restricted stock units (RSUs) |  |  |
Number of Shares |  |  |
Outstanding at the beginning of the period (in shares) | 1,462,239 | 865,408 | 1,058,608
Granted (in shares) | 15,664 | 1,183,094 | 229,603
Vested (in shares) | (285,375) | (492,825) | (271,683)
Forfeited (in shares) | (96,806) | (93,438) | (151,120)
Outstanding at the end of the period (in shares) | 1,095,722 | 1,462,239 | 865,408
Weighted Average Exercise Price |  |  |
Outstanding, beginning (in dollars per share) | $ 263.28 | $ 185.17 | $ 158.55
Granted (in dollars per share) | 323.92 | 301.62 | 249.31
Exercised (in dollars per share) | 191.21 | 223.00 | 129.21
Forfeited (in dollars per share) | 274.71 | 237.69 | 181.47
Outstanding, ending (in dollars per share) | $ 281.91 | $ 263.28 | $ 185.17
Share-based compensation expense | $ 281.9 | $ 217.8 | $ 48.6
Unrecognized compensation cost | $ 183.0 |  |
Weighted average recognized period | 1 year 3 months 18 days |  |
Ctrip 2007 Incentive Plan | Restricted stock units (RSUs) |  |  |
Share-based compensation arrangement by share-based payment award |  |  |
Requisite service period | 4 years |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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