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Contingencies (Details) $ in Thousands, $ in Thousands | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2017 USD ($) | Jan. 29, 2019 USD ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2017 MXN ($) | Nov. 06, 2017 USD ($) | Sep. 05, 2017 USD ($) | Dec. 31, 2004 USD ($) | Jul. 26, 2004 USD ($)
Disclosure of contingent liabilities in business combination [line items] |  |  |  |  |  |  |  |  |  |
Accounts payable |  |  |  |  | $ 4,390,413 | $ 3,984,898 |  |  |  |
Amount of lawsuit |  | $ 5,880 |  |  |  |  |  |  |  |
USD [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities in business combination [line items] |  |  |  |  |  |  |  |  |  |
Environmental liabilities | $ 2,600 |  | $ 2,700 |  |  |  |  |  |  |
Accounts payable | 1,000 |  | 1,000 |  |  |  |  |  |  |
Accumulated liabilities | $ 1,600 |  | $ 1,700 |  |  |  |  |  |  |
Amount of claims the payments |  |  |  |  |  |  |  | $ 1,400 |  |
Amount of add up |  |  |  |  |  |  | $ 5,000 |  |  |
Non-adjusting events after reporting period [member] | USD [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities in business combination [line items] |  |  |  |  |  |  |  |  |  |
Amount of penalty paid |  |  |  | $ 200 |  |  |  |  |  |
Pacific Steel [Member] | USD [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities in business combination [line items] |  |  |  |  |  |  |  |  |  |
Contingent amount to pay |  |  |  |  |  |  |  |  | $ 138 | $ 200

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