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INVESTMENT PROPERTIES (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Investment properties        
Investment properties at beginning of period   ¥ 1,503,266 ¥ 1,156,006  
Additions     44,063  
Transfer from property, plant and equipment (note 7)   78,135 179,564  
Transfer from right-of-use assets (note 20)   45,885 239,765  
Disposals   (1,005) (89,486)  
Depreciation   (24,405) (26,559) ¥ (22,229)
Impairment loss     (87)  
Investment properties at end of period $ 245,498 1,601,876 1,503,266 1,156,006
Cost        
Investment properties        
Investment properties at beginning of period   1,668,048    
Investment properties at end of period   1,823,560 1,668,048  
Accumulated amortization and impairment        
Investment properties        
Investment properties at beginning of period   (164,782)    
Investment properties at end of period   (221,684) (164,782)  
Buildings        
Investment properties        
Investment properties at beginning of period   414,168 235,974  
Additions     44,063  
Transfer from property, plant and equipment (note 7)   78,135 179,564  
Disposals     (36,949)  
Depreciation   (10,814) (8,484)  
Investment properties at end of period   481,489 414,168 235,974
Buildings | At fair values        
Investment properties        
Investment properties at beginning of period   1,071,000    
Investment properties at end of period   926,000 1,071,000  
Buildings | Cost        
Investment properties        
Investment properties at beginning of period   508,705    
Investment properties at end of period   601,850 508,705  
Buildings | Accumulated amortization and impairment        
Investment properties        
Investment properties at beginning of period   (94,537)    
Investment properties at end of period   (120,361) (94,537)  
Ownership certificates of investment properties        
Investment properties        
Investment properties at beginning of period   255,000    
Investment properties at end of period   ¥ 59,000 ¥ 255,000  
Carrying value to total asset value (as a percent) 0.03% 0.03% 0.13%  
Land use right        
Investment properties        
Investment properties at beginning of period   ¥ 1,089,098 ¥ 920,032  
Transfer from right-of-use assets (note 20)   45,885 239,765  
Disposals   (1,005) (52,537)  
Depreciation   (13,591) (18,075)  
Impairment loss     (87)  
Investment properties at end of period   1,120,387 1,089,098 ¥ 920,032
Land use right | At fair values        
Investment properties        
Investment properties at beginning of period   1,269,000    
Investment properties at end of period   1,296,000 1,269,000  
Land use right | Cost        
Investment properties        
Investment properties at beginning of period   1,159,343    
Investment properties at end of period   1,221,710 1,159,343  
Land use right | Accumulated amortization and impairment        
Investment properties        
Investment properties at beginning of period   (70,245)    
Investment properties at end of period   ¥ (101,323) ¥ (70,245)