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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

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