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Share-based payments - MIP I, movement in share options (Details) - MIP I
$ in Thousands
 12 Months Ended
Dec. 31, 2019
$ / shares
Dec. 31, 2019
MXN ($)
EquityInstruments
Dec. 31, 2018
$ / shares
Dec. 31, 2018
MXN ($)
EquityInstruments
Dec. 31, 2017
$ / shares
Dec. 31, 2017
MXN ($)
EquityInstruments
Share-based payments            
Outstanding at beginning of the year (shares) | EquityInstruments   10,433,981   12,437,857   12,557,857
Exercised during the year (shares) | EquityInstruments   (2,780,000)   (2,003,876)   (120,000)
Outstanding at end of the year (shares) | EquityInstruments   7,653,981   10,433,981   12,437,857
Outstanding at the beginning of the year (Exercise price) | $ / shares $ 5.31   $ 5.31   $ 5.31  
Exercise during the year (Exercise price) | $ / shares 5.31   5.31   5.31  
Outstanding at end of the year (Exercise price) | $ / shares $ 5.31   $ 5.31   $ 5.31  
Outstanding at beginning of the year (Total) | $   $ 55,441   $ 66,095   $ 66,733
Exercised during the year (Total) | $   (14,773)   (10,654)   (638)
Outstanding at end of the year (Total) | $   $ 40,668   $ 55,441   $ 66,095