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Other financial Liabilities - Derivative financial instruments (Details) € in Thousands, $ in Thousands |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May 12, 2017 EUR (€) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 EUR (€) | Dec. 31, 2018 USD ($) | May 12, 2017 USD ($) | Feb. 15, 2017 USD ($)
Other financial liabilities |  |  |  |  |  |  |
Market value |  |  | $ 4,392 |  | $ 3,079 |  |
Derivatives [member] |  |  |  |  |  |  |
Other financial liabilities |  |  |  |  |  |  |
Nominal Amount |  |  | 38,040 |  | 23,463 |  |
Cross currency swap |  |  |  |  |  |  |
Other financial liabilities |  |  |  |  |  |  |
Nominal Amount | € 176,638 |  |  |  | 42,500 | $ 192,500 |
Market value |  |  | 33,648 |  | 20,384 |  |
Foreign Currency Swaps |  |  |  |  |  |  |
Interest receivable (as a percent) | 9.375% |  |  |  |  |  |
Fixed Interest Rate | 8.062% |  |  |  |  | 8.062% |
Balance of CCS remained in the valuation adjustment reserve |  |  | 10,596 |  | 8,567 |  |
Income (Expense) recorded in financial derivative loss |  | $ 2,838 | 6,850 |  |  |  |
Cross currency swap | Exchange differences |  |  |  |  |  |  |
Foreign Currency Swaps |  |  |  |  |  |  |
Gain (loss) transferred from valuation adjustment reserve to income statement |  | 7,024 | (14,791) |  |  |  |
Cross currency swap | Finance costs |  |  |  |  |  |  |
Foreign Currency Swaps |  |  |  |  |  |  |
Gain (loss) transferred from valuation adjustment reserve to income statement |  | 951 | 1,216 |  |  |  |
Cash flow hedges [member] | Cross currency swap |  |  |  |  |  |  |
Foreign Currency Swaps |  |  |  |  |  |  |
Gain (loss) on ineffective hedge recognized in other comprehensive income |  | 10,006 | (24,171) |  |  |  |
Gain (loss) on change in fair value of hedged item used as basis for recognising hedge ineffectiveness |  | $ 10,333 |  |  |  |  |
Derivatives designated as hedging instruments | Cross currency swap |  |  |  |  |  |  |
Other financial liabilities |  |  |  |  |  |  |
Nominal Amount |  |  | 26,219 |  | 15,883 |  |
Derivatives designated as hedging instruments | Cash flow hedges [member] | Cross currency swap |  |  |  |  |  |  |
Other financial liabilities |  |  |  |  |  |  |
Nominal Amount |  |  |  |  | 150 |  |
Derivatives not designated as hedging instruments | Cross currency swap |  |  |  |  |  |  |
Other financial liabilities |  |  |  |  |  |  |
Nominal Amount |  |  | 7,429 |  | 4,501 |  |
Derivatives not designated as hedging instruments | Interest rate swap contract [member] |  |  |  |  |  |  |
Other financial liabilities |  |  |  |  |  |  |
Nominal Amount |  |  | $ 4,392 |  | $ 3,079 |  |
Senior Notes due 2022 issued by Ferroglobe PLC |  |  |  |  |  |  |
Other financial liabilities |  |  |  |  |  |  |
Nominal Amount |  |  |  |  |  |  | $ 150,000
Senior Notes due 2022 issued by Ferroglobe PLC | Cash flow hedges [member] | Cross currency swap |  |  |  |  |  |  |
Other financial liabilities |  |  |  |  |  |  |
Nominal Amount | € |  |  |  | € 150,000 |  |  |

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