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FAIR VALUE MEASUREMENT (Details) - Interest rate swap - USD ($) | Dec. 31, 2019 | Dec. 31, 2016
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Fair value measurements of the entity's assets or liabilities that are measured at fair value on a recurring basis |  |
Notional amount | $ 47,439,000 |
Derivative liabilities | $ 2,170,000 |
Designated as hedging instruments | Cash flow hedge |  |
Fair value measurements of the entity's assets or liabilities that are measured at fair value on a recurring basis |  |
Total notional |  | $ 399,000,000,000

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