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Income tax incurred and deferred: (Details 6) - 12 months ended Dec. 31, 2018
$ in Thousands, $ in Thousands
MXN ($)
USD ($)
Unused tax losses for which no deferred tax asset recognised $ 3,259,560 $ 165,881
Tax loss Year 2012 Expiring in 2022 [Member]    
Unused tax losses for which no deferred tax asset recognised $ 139,220 7,085
Expiration Year 2022  
Tax loss Year 2013 Expiring in 2023 [Member]    
Unused tax losses for which no deferred tax asset recognised $ 732,080 37,256
Expiration Year 2023  
Tax loss Year 2014 Expiring in 2024 [Member]    
Unused tax losses for which no deferred tax asset recognised $ 501,959 25,545
Expiration Year 2024  
Tax loss Year 2015 Expiring in 2025 [Member]    
Unused tax losses for which no deferred tax asset recognised $ 560,418 28,520
Expiration Year 2025  
Tax loss Year 2016 Expiring in 2026 [Member]    
Unused tax losses for which no deferred tax asset recognised $ 545,189 27,745
Expiration Year 2026  
Tax Loss Year 2017 Expiring In 2027 [Member]    
Unused tax losses for which no deferred tax asset recognised $ 437,173 22,248
Expiration Year 2027  
Tax Loss Year 2018 Expiring In 2028 [Member]    
Unused tax losses for which no deferred tax asset recognised $ 343,521 $ 17,482
Expiration Year 2028