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Other financial Liabilities (Details) € in Thousands, $ in Thousands | Sep. 08, 2016 EUR (€) installment agreement | Dec. 31, 2018 EUR (€) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 EUR (€) | Dec. 31, 2017 USD ($)
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Categories of financial liabilities [abstract] |  |  |  |  |
Non-Current |  |  | $ 32,788 |  | $ 49,011
Current |  |  | 52,524 |  | 88,420
Total |  |  | 85,312 |  | 137,431
Financial Loans With Governments Agencies [Member] |  |  |  |  |
Categories of financial liabilities [abstract] |  |  |  |  |
Non-Current |  |  | 9,325 |  | 10,971
Current |  |  | 52,524 |  | 88,420
Total |  |  | 61,849 |  | 99,391
Financial Loans With Governments Agencies [Abstract] |  |  |  |  |
Interest rate (as a percent) | 2.29% |  |  |  |
Amortized cost |  | € 44,706 | 51,189 | € 72,517 | 86,969
Loan Number 1 [Member] |  |  |  |  |
Financial Loans With Governments Agencies [Abstract] |  |  |  |  |
Loans received | € | € 44,999 |  |  |  |
Number of loan installments | installment | 7 |  |  |  |
Borrowings Term | 10 years |  |  |  |
Grace period at start of loan | 3 years |  |  |  |
Loan Number 2 [Member] |  |  |  |  |
Financial Loans With Governments Agencies [Abstract] |  |  |  |  |
Loans received | € | € 26,909 |  |  |  |
Derivatives [member] |  |  |  |  |
Categories of financial liabilities [abstract] |  |  |  |  |
Non-Current |  |  | 23,463 |  | 38,040
Total |  |  | $ 23,463 |  | $ 38,040
FerroAtlantica De Venezuela SA | Financial Loans With Governments Agencies [Member] |  |  |  |  |
Financial Loans With Governments Agencies [Abstract] |  |  |  |  |
Number of loan agreements | agreement | 2 |  |  |  |

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- Definition Period of time between issuance and maturity of bank borrowings , in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The amount of financial liabilities at amortised cost. The amortised cost is the amount at which financial liabilities are measured at initial recognition minus principal repayments, plus or minus the cumulative amortisation using the effective interest method of any difference between that initial amount and the maturity amount. [Refer: Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 8 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_8_g&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 8 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_f&doctype=Standard&book=b -URIDate 2018-03-16 + Details
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