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INTANGIBLE ASSETS - Amortization Expense (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
INTANGIBLE ASSETS        
Amortization expense $ 6,100 ¥ 42,467 ¥ 38,525 ¥ 10,245
Estimated amortization expenses        
2020   39,982    
2021   38,796    
2022   38,341    
2023   30,790    
2024 and thereafter   ¥ 55,253