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OTHER LONG-TERM LIABILITIES (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Other long-term liabilities    
Consideration payable for acquisitions ¥ 97,457 ¥ 23,062
Payables for purchase of property and equipment 139,162 231,459
Deferred revenue - non-current (Note 4) 14,871 15,419
Deferred government grants 6,196 6,507
Interest rate swap contracts (Note 16)   10,408
Asset retirement obligations 76,909 52,441
Others 14,662 6,241
Total ¥ 349,257 ¥ 345,537