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Share-based payments - SARs (cash settled) (Details)
$ in Thousands
12 Months Ended
Nov. 06, 2014
MXN ($)
EquityInstruments
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Share-based payments        
Compensation expense recorded in the consolidated statement of operations   $ 105,303    
Compensation (benefit) recorded in the consolidated statement of operations     $ 40,724 $ (5,238)
SARs - cash settled        
Share-based payments        
Granted | EquityInstruments 4,315,264      
Vesting period 3 years      
Total amount granted $ 10,831      
Carrying amount of the liability     1,901 537
Compensation expense recorded in the consolidated statement of operations     2,964  
Compensation (benefit) recorded in the consolidated statement of operations   $ (1,901)   $ (186)
Cash payment related to key employees related to SARs plan     $ 2,395