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Financial information by segments (Schedule of Information by Region) (Details) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of operating segments [line items] |  |  |
Net sales | $ 35,869,314 | $ 34,171,201 | $ 35,678,253
Cost of sales | 29,211,724 | 30,067,141 | 30,563,315
Gross profit | 6,657,590 | 4,104,060 | 5,114,938
Administrative expenses | (2,019,328) | 1,637,425 | 1,080,012
Other income (expenses), net | 546,749 | (136,582) | 15,052
Interest income | 107,826 | 145,995 | 312,821
Interest expense | (53,746) | (55,049) | (16,511)
Exchange rate gain (loss), net | (363,164) | (784,583) | (146,896)
Income (loss) before income taxes | 4,875,927 | 1,636,416 | 4,199,392
Income taxes | 2,077,844 | 3,276,274 | 752,462
Net income (loss) for the year | 2,798,083 | (1,639,858) | 3,446,930
Depreciation and amortization | 1,452,271 | 1,108,629 | 1,112,418
Total assets | 45,503,647 | 44,014,759 | 48,853,823
Total liabilities | 12,484,988 | 11,404,982 | 13,344,820
Acquisitions of property, plant and equipment | 951,205 | 1,271,420 | 1,994,465
Mexico [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net sales | 19,660,889 | 18,530,672 | 20,507,794
Cost of sales | 15,459,258 | 14,934,575 | 15,715,761
Gross profit | 4,201,631 | 3,596,097 | 4,792,033
Administrative expenses | (1,117,817) | 848,495 | 592,218
Other income (expenses), net | (52,605) | 175,412 | 11,367
Interest income | 107,604 | 145,729 | 307,279
Interest expense | (5,108) | 3,438 | 52,226
Exchange rate gain (loss), net | 483,822 | 628,044 | 445,289
Income (loss) before income taxes | 2,755,145 | 2,093,313 | 5,015,976
Income taxes | 1,747,568 | 3,505,015 | 905,482
Net income (loss) for the year | 1,007,577 | (1,411,702) | 4,110,494
Depreciation and amortization | 693,362 | 577,048 | 587,407
Total assets | 33,386,043 | 32,935,743 | 40,617,874
Total liabilities | 6,944,579 | 7,253,713 | 8,458,465
Acquisitions of property, plant and equipment | 278,700 | 785,818 | 1,552,587
USA [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net sales | 5,549,781 | 7,120,360 | 9,246,444
Cost of sales | 5,677,638 | 7,752,776 | 9,294,352
Gross profit | (127,857) | (632,416) | (47,908)
Administrative expenses | (240,726) | 267,756 | 267,905
Other income (expenses), net | (505,946) | (71,324) | 3,685
Interest income | 222 | 266 | 5,542
Interest expense | (16,104) | (84,621) | (99,985)
Exchange rate gain (loss), net | (1,510) | (2,745) | 7,522
Income (loss) before income taxes | 123,001 | (910,458) | (399,049)
Income taxes | 118,926 | (236,598) | 7,145
Net income (loss) for the year | 4,075 | (673,860) | (406,194)
Depreciation and amortization | 332,186 | 260,760 | 268,635
Total assets | 9,237,831 | 8,419,771 | 10,181,967
Total liabilities | 4,797,682 | 4,219,817 | 10,815,692
Acquisitions of property, plant and equipment | 41,054 | 278,467 | 433,154
Brazil [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net sales | 10,659,259 | 8,520,169 | 5,924,015
Cost of sales | 8,075,253 | 7,379,790 | 5,553,202
Gross profit | 2,583,806 | 1,140,379 | 370,813
Administrative expenses | (660,785) | 521,174 | 219,889
Other income (expenses), net | 11,854 | 32,494 |
Interest income | 0 | 0 |
Interest expense | (66,007) | (110,919) | (103,141)
Exchange rate gain (loss), net | 1,096,416 | 177,314 | (602,747)
Income (loss) before income taxes | 748,744 | 298,478 | (554,964)
Income taxes | 211,350 | 7,857 | (160,165)
Net income (loss) for the year | 537,394 | 290,621 | (394,799)
Depreciation and amortization | 426,723 | 270,821 | 256,376
Total assets | 5,807,121 | 6,002,701 | 6,733,362
Total liabilities | 3,670,075 | 3,274,908 | 2,750,043
Acquisitions of property, plant and equipment | 631,451 | 207,135 | 8,724
Eliminations Between Segments [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Interest expense | 33,473 | 137,053 | 134,389
Exchange rate gain (loss), net | (1,215,564) | (18,030) | 3,040
Income (loss) before income taxes | 1,249,037 | 155,083 | 137,429
Net income (loss) for the year | 1,249,037 | 155,083 | 137,429
Total assets | (2,927,348) | (3,343,456) | (8,679,380)
Total liabilities | $ (2,927,348) | $ (3,343,456) | $ (8,679,380)

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