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PRINCIPAL ACCOUNTING POLICIES - Leases (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Jan. 01, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Principal accounting policies        
Prepayments $ 96,126 ¥ 669,208   ¥ 606,918
Right-of-use assets 46,081 320,809    
Lease liabilities   85,580    
Property and equipment, net $ 39,061 ¥ 271,932   ¥ 527,020
ASU 2016-02 | Land use rights        
Principal accounting policies        
Right-of-use assets     ¥ 108,400  
Lease liabilities     103,700  
ASU 2016-02 | Restatement Adjustment        
Principal accounting policies        
Retained earnings     0  
Prepayments     (4,700)  
ASU 2016-02 | Restatement Adjustment | Land use rights        
Principal accounting policies        
Property and equipment, net     ¥ (236,700)