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LEASE (Summary of future lease payments) (Details) - Dec. 31, 2019
¥ in Thousands, $ in Thousands
USD ($)
CNY (¥)
Lessee, Operating Lease, Liability, Payment, Due [Abstract]    
2020 $ 3,643 ¥ 25,362
2021 3,516 24,481
2022 2,967 20,654
2023 2,872 19,996
2024 2,773 19,306
Thereafter 36,796 256,158
Total future lease payments 52,567 365,957
Less: Imputed interest 19,285 134,256
Total lease liability balance $ 33,282 ¥ 231,701