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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 ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 USD ($)
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.

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Length of the grace period for no installments due at the beginning of the loan.

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The interest rate on borrowings. [Refer: Borrowings]

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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]

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