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Other accounts receivable, net - Aging of accounts receivable (Details) - MXN ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts receivable aging        
Impaired accounts receivable $ 40,308 $ 11,304 $ 17,809 $ 19,317
Not impaired accounts receivable 923,000 508,479 478,467  
Total accounts receivable 963,308 519,783 496,276  
0-30 Days        
Accounts receivable aging        
Impaired accounts receivable 5,804 8,725 16,962  
Not impaired accounts receivable 722,651 388,644 415,847  
Total accounts receivable 728,455 397,369 432,809  
31-60 Days        
Accounts receivable aging        
Not impaired accounts receivable 64,983 69,648 38,705  
Total accounts receivable 64,983 69,648 38,705  
61-90 Days        
Accounts receivable aging        
Not impaired accounts receivable 19,274 27,138 17,918  
Total accounts receivable 19,274 27,138 17,918  
91-120 Days        
Accounts receivable aging        
Impaired accounts receivable 34,504 2,579 847  
Not impaired accounts receivable 116,092 23,049 5,997  
Total accounts receivable $ 150,596 $ 25,628 $ 6,844