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LEASE (Lease income) (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Sales-type leases [Member]        
Lessee, Lease, Description [Line Items]        
Selling loss recognized at the commencement date     ¥ (21,229) $ (3,049)
Interest income on net investment in the lease ¥ 4,130 $ 633 1,130 162
Including: Income relating to variable lease payments not included in the measurement of the net investment in a lease 4,130 633 1,130 162
Direct financing leases [Member]        
Lessee, Lease, Description [Line Items]        
Interest income on net investment in the lease 2,929 449 3,944 567
Operating leases [Member]        
Lessee, Lease, Description [Line Items]        
Lease income relating to lease payments 45,847 7,026 53,485 7,683
Including: Income relating to variable lease payments not included in the measurement of lease receivable ¥ 38,999 $ 5,977 ¥ 45,887 $ 6,591