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DERIVATIVE FINANCIAL INSTRUMENTS - Balance sheet location (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($)
--- | --- | --- | ---
DERIVATIVE FINANCIAL INSTRUMENTS |  |  |
Interest rate swap contracts |  | ¥ 10,408 |
Interest rate swap contracts |  |  |
DERIVATIVE FINANCIAL INSTRUMENTS |  |  |
Derivative, Notional Amount | $ | $ 0 |  | $ 118,500
Interest rate swap contracts | Not designated as hedging instrument | Accrued expenses and other payables |  |  |
DERIVATIVE FINANCIAL INSTRUMENTS |  |  |
Interest rate swap contracts |  | 351 |
Interest rate swap contracts | Not designated as hedging instrument | Other long-term liabilities |  |  |
DERIVATIVE FINANCIAL INSTRUMENTS |  |  |
Interest rate swap contracts |  | ¥ 10,408 |

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