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DEBT - Convertible Senior Notes (Details)
$ / shares in Units, ¥ in Thousands
12 Months Ended
May 12, 2020
CNY (¥)
May 12, 2020
USD ($)
Nov. 03, 2017
USD ($)
$ / shares
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
shares
Dec. 31, 2020
CNY (¥)
shares
Nov. 01, 2022
USD ($)
May 26, 2020
USD ($)
May 12, 2020
USD ($)
$ / shares
DEBT                    
Note repurchased       ¥ 3,406,000 $ 494,000,000 ¥ 0        
Convertible Senior Notes Due 2022                    
DEBT                    
Number of shares converted | shares           1,340 2,020      
Amount converted | ¥           ¥ 0 ¥ 0      
Convertible Debt | Convertible Senior Notes Due 2022                    
DEBT                    
Aggregate principal amount     $ 475,000,000              
Fixed interest rate (as a percent)     0.375%              
Initial conversion price | $ / shares     $ 182.25              
Repurchase price as a percentage of principal amount     100.00%              
Initial conversion rate per ADS     5.4869              
Increment used for debt conversion     $ 1,000              
Number of shares converted | shares           134 202      
Amount converted | ¥           ¥ 40 ¥ 60      
Notes redeemed               $ 475,000,000    
Convertible Debt | 2026 Notes                    
DEBT                    
Aggregate principal amount                   $ 450,000,000
Additional aggregate maximum amount of notes to purchase                 $ 50,000,000  
Fixed interest rate (as a percent) 3.00%                 3.00%
Proceeds from issuance of debt ¥ 3,499,000 $ 493,000,000                
Debt issuance costs ¥ 49,000                 $ 7,000,000
Initial conversion price | $ / shares                   $ 23.971
Repurchase price as a percentage of principal amount 100.00% 100.00%                
Initial conversion rate per ADS 41.72 41.72                
Increment used for debt conversion   $ 1,000