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LEASE (Schedule of future lease payments) (Details) - Dec. 31, 2020
¥ in Thousands, $ in Thousands
CNY (¥)
USD ($)
Lessee, Operating Lease, Liability, Payment, Due [Abstract]    
2021 ¥ 25,620 $ 3,926
2022 27,657 4,239
2023 25,518 3,911
2024 22,708 3,480
2025 23,115 3,543
Thereafter 235,590 36,106
Total future lease payments 360,208 55,205
Less: Imputed interest 123,069 18,861
Total lease liability balance ¥ 237,139 $ 36,344