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Other accounts receivable, net - Aging of accounts receivable (Details) - MXN ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts receivable aging        
Impaired accounts receivable $ 32,708 $ 40,308 $ 11,304 $ 17,809
Not impaired accounts receivable 560,640 923,000    
Total accounts receivable 593,348 963,308    
0-30 Days        
Accounts receivable aging        
Impaired accounts receivable 4,090 5,804    
Not impaired accounts receivable 486,001 722,651    
Total accounts receivable 490,091 728,455    
31-60 Days        
Accounts receivable aging        
Not impaired accounts receivable 13,872 64,983    
Total accounts receivable 13,872 64,983    
61-90 Days        
Accounts receivable aging        
Not impaired accounts receivable 6,081 19,274    
Total accounts receivable 6,081 19,274    
91-120 Days        
Accounts receivable aging        
Impaired accounts receivable 28,618 34,504    
Not impaired accounts receivable 54,686 116,092    
Total accounts receivable $ 83,304 $ 150,596