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Other (income) expenses, net (Schedule of Other Income (Expenses) Net) (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Analysis of income and expense [abstract]      
Cancellation of balances $ 87,241 $ 786 $ 2,615
Land treatments in Pacific Steel, Inc. 3,362 8,922 7,674
Attorney’s fees 54,520 0 0
Bad debt estimate 5,320 0 0
Other expenses 150,443 9,708 10,289
Sale of scrap (3,182) (9,865) (10,434)
Recovery of loss (6,397) (6,405)  
Update of balances in favor in taxes   (2,699) (519)
Other income (4,282) (5,791) (6,270)
Other income (13,861) (24,760) (17,223)
Other (income) and other expenses, net $ 136,582 $ (15,052) $ (6,934)