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Inventories (Schedule of Short-term and Long-term Inventories) (Details) - MXN ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Short-term:    
Finished goods $ 1,961,627 $ 1,572,134
Work in process 79,914 61,129
Billets 2,046,143 1,443,938
Raw materials and supplies 4,576,732 3,728,737
Materials, spare parts and rollers 1,154,586 1,331,079
Materials in transit 319,420 126,481
Short-term Inventories, net 10,138,422 8,263,498
Long-term:    
Coke 952,786 1,037,470
Spare parts 54,783 49,831
Rollers 140,009 133,465
Finished godos 353,095 353,095
Long-term inventories, gross 1,500,673 1,573,861
Less, valuation allowance at the lower of cost or net realizable value (353,095) (353,095)
Long-term inventories, net $ 1,147,578 $ 1,220,766