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INTANGIBLE ASSETS, NET (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Intangible assets      
Intangible assets, gross ¥ 967,882 ¥ 553,322  
Less: accumulated amortization (182,560) (158,694)  
Intangible assets, net 785,322 394,628  
Amortization of intangible assets 68,688 58,312 ¥ 52,974
Estimated future amortization expense      
2021 114,844    
2022 114,844    
2023 113,302    
2024 106,443    
2025 92,131    
Thereafter 243,758    
Customer relationships      
Intangible assets      
Intangible assets, gross 952,100 547,322  
Licenses      
Intangible assets      
Intangible assets, gross ¥ 15,782 ¥ 6,000