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Other accounts receivable, net - Aging of accounts receivable (Details) - MXN ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounts receivable aging        
Impaired accounts receivable $ 11,304 $ 17,809 $ 19,317 $ 24,612
Not impaired accounts receivable 508,479 478,467 427,403  
Total accounts receivable 519,783 496,276 446,720  
0-30 Days        
Accounts receivable aging        
Impaired accounts receivable 8,725 16,962 15,723  
Not impaired accounts receivable 388,644 415,847 398,721  
Total accounts receivable 397,369 432,809 414,444  
31-60 Days        
Accounts receivable aging        
Not impaired accounts receivable 69,648 38,705 11,231  
Total accounts receivable 69,648 38,705 11,231  
61-90 Days        
Accounts receivable aging        
Not impaired accounts receivable 27,138 17,918 14,492  
Total accounts receivable 27,138 17,918 14,492  
91-120 Days        
Accounts receivable aging        
Impaired accounts receivable 2,579 847 3,594  
Not impaired accounts receivable 23,049 5,997 2,959  
Total accounts receivable $ 25,628 $ 6,844 $ 6,553