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Income tax incurred and deferred: (Details) - MXN ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets $ 303,612 $ 327,020    
Deferred tax liability - Net 3,081,668 3,033,930 $ 1,870,660 $ 1,523,722
Not later than one year [member]        
Deferred tax assets 53,121 73,710    
Later than one year [member]        
Deferred tax assets 250,491 253,310    
Deferred tax liabilities $ (3,385,280) $ (3,360,950)