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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

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