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SUBSEQUENT EVENTS (Details) - Subsequent Events $ / shares in Units, ¥ in Thousands, $ in Thousands |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 4 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 10, 2017 CNY (¥) | Dec. 31, 2017 CNY (¥) | Nov. 30, 2017 $ / shares shares | Oct. 31, 2017 USD ($) $ / shares shares | Jan. 23, 2018 CNY (¥) | Jan. 23, 2018 CNY (¥) | Jan. 23, 2018 USD ($) | Jan. 23, 2018 CNY (¥) | Nov. 30, 2017 CNY (¥)
Convertible Bonds due 2019 |  |  |  |  |  |  |  |  |
Conversion of Convertible Bonds due 2019 |  |  |  |  |  |  |  |  |
Maximum principal amount convertible to ordinary shares |  |  |  |  |  |  |  |  | 100.00%
Class A ordinary shares | Convertible Bonds due 2019 |  |  |  |  |  |  |  |  |
Conversion of Convertible Bonds due 2019 |  |  |  |  |  |  |  |  |
Number of shares issued on conversion (in shares) | shares |  |  | 97,870,263 |  |  |  |  |  |
Conversion price (in USD/share) | $ / shares |  |  | $ 1.675262 |  |  |  |  |  |
Data center project in Guangzhou, China (Guangzhou 2) |  |  |  |  |  |  |  |  |
Merger and acquisition |  |  |  |  |  |  |  |  |
Aggregate purchase price | ¥ 233,984 |  |  |  |  |  |  |  |
CyrusOne Inc., | Private Placement | Class A ordinary shares |  |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) | shares |  |  |  | 64,257,028 |  |  |  |  |
Price per share (in USD/share) | $ / shares |  |  |  | $ 1.55625 |  |  |  |  |
Total consideration received | $ |  |  |  | $ 100,000 |  |  |  |  |
Subsidiary I | Facility agreement with a third party bank |  |  |  |  |  |  |  |  |
New Project Loan Facilities and Financing Arrangement |  |  |  |  |  |  |  |  |
Term of loan |  |  |  | 42 months |  |  |  |  |
Loan drew down |  |  |  |  |  |  | $ 25,000 | ¥ 166,000 |
Effective interest rate (as a percent) |  |  |  | 5.60% |  |  |  |  |
Subsidiary I | Facility agreement with a third party bank | LIBOR |  |  |  |  |  |  |  |  |
New Project Loan Facilities and Financing Arrangement |  |  |  |  |  |  |  |  |
Variable interest rate |  |  |  | three-month LIBOR |  |  |  |  |
Interest rate spread |  |  |  | 4.25% |  |  |  |  |
Subsidiary J | Facility agreement with a third party bank |  |  |  |  |  |  |  |  |
New Project Loan Facilities and Financing Arrangement |  |  |  |  |  |  |  |  |
Term of loan |  |  | 5 years |  |  |  |  |  |
Loan drew down |  |  |  |  |  | ¥ 175,782 |  |  |
Principal amount of credit facility |  |  |  |  |  |  |  |  | ¥ 180,000
Subsidiary J | Facility agreement with a third party bank | Minimum |  |  |  |  |  |  |  |  |
New Project Loan Facilities and Financing Arrangement |  |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  |  |  |  |  | 5.655%
Subsidiary J | Facility agreement with a third party bank | Maximum |  |  |  |  |  |  |  |  |
New Project Loan Facilities and Financing Arrangement |  |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  |  |  |  |  | 6.175%
Subsidiary K | Facility agreement with a third party bank |  |  |  |  |  |  |  |  |
New Project Loan Facilities and Financing Arrangement |  |  |  |  |  |  |  |  |
Term of loan |  |  | 6 years |  |  |  |  |  |
Loan drew down |  |  |  |  |  | ¥ 402,251 |  |  |
Principal amount of credit facility |  |  |  |  |  |  |  |  | ¥ 428,000
Effective interest rate (as a percent) |  |  |  |  |  |  |  |  | 6.37%
Subsidiary L | Facility agreement with a third party bank |  |  |  |  |  |  |  |  |
New Project Loan Facilities and Financing Arrangement |  |  |  |  |  |  |  |  |
Term of loan |  | 7 years |  |  |  |  |  |  |
Loan drew down |  |  |  |  | ¥ 845,000 |  |  |  |
Principal amount of credit facility |  | ¥ 1,010,000 |  |  |  |  |  |  |
Effective interest rate (as a percent) |  | 7.35% |  |  |  |  |  |  |
Subsidiary M | Financing arrangement with a third-party financer |  |  |  |  |  |  |  |  |
New Project Loan Facilities and Financing Arrangement |  |  |  |  |  |  |  |  |
Term of loan |  |  | 5 years |  |  |  |  |  |
Principal amount of credit facility |  |  |  |  |  |  |  |  | ¥ 200,000
Effective interest rate (as a percent) |  |  |  |  |  |  |  |  | 9.70%
Subsidiary N | Facility agreement with a third party bank |  |  |  |  |  |  |  |  |
New Project Loan Facilities and Financing Arrangement |  |  |  |  |  |  |  |  |
Term of loan |  | 10 years |  |  |  |  |  |  |
Loan drew down |  |  |  |  | ¥ 57,067 |  |  |  |
Principal amount of credit facility |  | ¥ 100,000 |  |  |  |  |  |  |
Effective interest rate (as a percent) |  | 5.88% |  |  |  |  |  |  |

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