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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