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Inventories (Schedule of Short-term and Long-term Inventories) (Details) - MXN ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Short-term:    
Finished goods $ 1,900,624 $ 1,961,627
Work in process 109,247 79,914
Billets 1,791,802 2,046,143
Raw materials and supplies 2,760,319 4,576,732
Materials, spare parts and rollers 1,146,705 1,154,586
Materials in transit 534,516 319,420
Short-term Inventories, net 8,243,213 10,138,422
Long-term:    
Coke 747,300 952,786
Spare parts 68,587 54,783
Rollers 144,486 140,009
Finished godos 353,095 353,095
Long-term inventories, gross 1,313,468 1,500,673
Less, valuation allowance at the lower of cost or net realizable value (353,095) (353,095)
Long-term inventories, net $ 960,373 $ 1,147,578