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SHORT-TERM INVESTMENTS (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
SHORT-TERM INVESTMENTS |  |
Annual interest rate (as a percent) | 1.10% |
Minimum |  |
SHORT-TERM INVESTMENTS |  |
Annual interest rate (as a percent) |  | 1.10%
Maximum |  |
SHORT-TERM INVESTMENTS |  |
Annual interest rate (as a percent) |  | 1.20%

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