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LEASE (Narrative) (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2020
USD ($)
Lessor, Lease, Description [Line Items]          
Lease receivables ¥ 5,018   ¥ 4,318   $ 769
Lease receivables pledged as collaterals for bank and other borrowings 26,782   24,997   4,105
Derecognition of underlying assets 179,093 $ 27,447 167,165    
Operating lease income 45,847 7,026 53,485 ¥ 71,864  
Short-term Lease, Cost 930 143      
Secured Debt, Other 414,470   416,548   63,520
Prepaid land lease amortization expenses 426,517 65,367 428,861    
Right-of-use asset amortization expenses 9,513 1,458 9,462 9,610  
Failed sale-leaseback transactions as seller-lessee          
Sale leaseback liability current 91,904       14,085
Interest expenses 44,880 6,878 ¥ 21,644 ¥ 119  
Sale leaseback liability non current 478,694       $ 73,363
Cost of revenue          
Lessor, Lease, Description [Line Items]          
Short-term Lease, Cost 16,792 2,574      
General and administrative expenses          
Lessor, Lease, Description [Line Items]          
Short-term Lease, Cost ¥ 13,417 $ 2,056      
Minimum          
Failed sale-leaseback transactions as seller-lessee          
Effective interest rate 9.10%       9.10%
Maximum          
Failed sale-leaseback transactions as seller-lessee          
Effective interest rate 14.35%       14.35%