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Financial information by segments (Schedule of Information by Region) (Details) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of operating segments [line items] |  |  |
Net sales | $ 35,678,253 | $ 28,700,450 | $ 27,515,565
Cost of sales | (30,563,315) | (23,994,526) | (22,775,593)
Gross profit income | 5,114,938 | 4,705,924 | 4,739,972
Administrative expenses | (1,080,012) | (1,238,943) | (1,277,487)
Other income (expenses), net | 15,052 | 6,934 | (36,198)
Interest income | 312,821 | 252,291 | 140,033
Interest expense | 16,511 | 54,404 | 40,170
Exchange rate gain (loss), net | (146,896) | (654,362) | 1,774,984
Income (loss) before income taxes | 4,199,392 | 3,017,440 | 5,301,134
Income taxes | 752,462 | 1,122,809 | 936,394
Net income (loss) for the year | 3,446,930 | 1,894,631 | 4,364,740
Other information: |  |  |
Depreciation and amortization | 1,112,418 | 1,465,759 | 1,429,381
Total assets | 48,853,823 | 45,976,531 | 41,879,728
Total liabilities | 13,344,820 | 11,658,995 | 8,648,055
Acquisitions of property, plant and equipment | 1,994,465 | 3,039,501 | 3,100,259
Mexico [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net sales | 20,507,794 | 17,125,369 | 16,361,808
Cost of sales | (15,715,761) | (13,340,648) | (13,724,880)
Gross profit income | 4,792,033 | 3,784,721 | 2,636,928
Administrative expenses | (592,218) | (753,676) | (901,849)
Other income (expenses), net | 11,367 | (98,915) | (40,134)
Interest income | 307,279 | 252,074 | 139,886
Interest expense | 52,226 | (7,459) | 15,053
Exchange rate gain (loss), net | 445,289 | (1,291,909) | 2,343,393
Income (loss) before income taxes | 5,015,976 | 1,884,836 | 4,163,171
Income taxes | 905,482 | 786,902 | 678,020
Net income (loss) for the year | 4,110,494 | 1,097,934 | 3,485,151
Other information: |  |  |
Depreciation and amortization | 587,407 | 677,665 | 620,354
Total assets | 40,617,874 | 32,878,144 | 33,152,640
Total liabilities | 8,458,465 | 1,134,438 | 4,161,650
Acquisitions of property, plant and equipment | 1,552,587 | 2,394,541 | 2,169,375
USA [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net sales | 9,246,444 | 8,370,999 | 9,339,527
Cost of sales | (9,294,352) | (7,814,180) | (7,332,094)
Gross profit income | (47,908) | 556,819 | 2,007,433
Administrative expenses | (267,905) | (257,001) | (298,967)
Other income (expenses), net | 3,685 | 105,849 | (1,481,573)
Interest income | 5,542 | 217 | 147
Interest expense | (99,985) | (50,962) | 45,120
Exchange rate gain (loss), net | 7,522 | (26,256) | 42,727
Income (loss) before income taxes | (399,049) | 328,666 | 3,187,793
Income taxes | 7,145 | 322,444 | 256,089
Net income (loss) for the year | (406,194) | 6,222 | 2,931,704
Other information: |  |  |
Depreciation and amortization | 268,635 | 538,699 | 551,650
Total assets | 10,181,967 | 10,548,895 | 9,684,303
Total liabilities | 10,815,692 | 10,760,999 | 9,893,536
Acquisitions of property, plant and equipment | 433,154 | 622,785 | 816,586
Brazil [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Net sales | 5,924,015 | 3,204,082 | 1,814,230
Cost of sales | (5,553,202) | (2,839,698) | (1,718,619)
Gross profit income | 370,813 | 364,384 | 95,611
Administrative expenses | (219,889) | (228,266) | (76,671)
Other income (expenses), net |  |  |
Interest income |  |  |
Interest expense | (103,141) | (65,186) | 50,980
Exchange rate gain (loss), net | (602,747) | 1,861 | 765,684
Income (loss) before income taxes | (554,964) | 72,793 | 733,644
Income taxes | (160,165) | 13,463 | 2,285
Net income (loss) for the year | (394,799) | 59,330 | 731,359
Other information: |  |  |
Depreciation and amortization | 256,376 | 249,395 | 257,377
Total assets | 6,733,362 | 5,356,860 | 5,293,891
Total liabilities | 2,750,043 | 2,570,925 | 2,325,325
Acquisitions of property, plant and equipment | 8,724 | 22,175 | 114,298
Eliminations Between Segments [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Other income (expenses), net |  |  | 1,477,637
Interest expense | 134,389 | 69,203 | (70,983)
Exchange rate gain (loss), net | 3,040 | 661,942 | (1,376,820)
Income (loss) before income taxes | 137,429 | 731,145 | (2,783,474)
Net income (loss) for the year | 137,429 | 731,145 | (2,783,474)
Other information: |  |  |
Total assets | (8,679,380) | (2,807,367) | (6,463,293)
Total liabilities | $ (8,679,380) | $ (2,807,925) | $ (7,940,930)

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