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Revenue from Contracts with Customers: (Details 3) - MXN ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Minimum lease payments receivable under non-cancellable operating lease $ 28,916,592 $ 22,085,023 $ 17,443,978
2017      
Minimum lease payments receivable under non-cancellable operating lease     3,260,667
2018      
Minimum lease payments receivable under non-cancellable operating lease   3,986,487 1,974,566
2019      
Minimum lease payments receivable under non-cancellable operating lease 3,535,065 2,584,950 1,808,104
2020      
Minimum lease payments receivable under non-cancellable operating lease 3,257,229 2,358,698 1,659,090
2021      
Minimum lease payments receivable under non-cancellable operating lease 2,880,142 2,054,600 1,918,838
2022      
Minimum lease payments receivable under non-cancellable operating lease 2,861,442 4,159,744 2,093,277
2023 to 2028      
Minimum lease payments receivable under non-cancellable operating lease $ 16,382,714 $ 6,940,544 $ 4,729,436