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Financial risk management (Details) $ in Thousands |  | 1 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 15, 2017 USD ($) | Feb. 28, 2017 USD ($) | May 31, 2012 item | Feb. 22, 2019 USD ($) | Dec. 31, 2018 USD ($) | Feb. 28, 2018 USD ($) | Dec. 31, 2017 USD ($)
Financial risk management |  |  |  |  |  |  |
Cessation of percentage of voting interest which occur in change in control | 100.00% |  |  |  |  |  |
Borrowings |  |  |  |  | $ 141,012 |  | $ 1,003
Credit facilities |  |  |  |  |  |  |
Financial risk management |  |  |  |  |  |  |
Principal amount |  |  |  |  | 250,000 |  | 200,000
Borrowings |  |  |  |  | 133,314 |  | 0
Borrowings |  |  |  |  | 135,919 |  |
Senior Notes due 2022 |  |  |  |  |  |  |
Financial risk management |  |  |  |  |  |  |
Principal amount | $ 350,000 |  |  |  | $ 350,000 |  | 350,000
Fixed Interest Rate | 9.375% |  |  |  |  |  |
Redemption price of notes at change of control | 101.00% |  |  |  |  |  |
Senior Notes due 2022 issued by Ferroglobe PLC |  |  |  |  |  |  |
Financial risk management |  |  |  |  |  |  |
Principal amount | $ 150,000 |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |
Financial risk management |  |  |  |  |  |  |
Principal amount |  |  |  | $ 200,000 |  | $ 250,000 |
New Revolving Credit Facility |  |  |  |  |  |  |
Financial risk management |  |  |  |  |  |  |
Fixed Interest Rate |  |  |  |  | 5.20% |  |
Foreign currency risk |  |  |  |  |  |  |
Financial risk management |  |  |  |  |  |  |
Percentage of Principal and Interest Payments |  | 55.00% |  |  |  |  |
Foreign currency risk | Senior Notes due 2022 |  |  |  |  |  |  |
Financial risk management |  |  |  |  |  |  |
Principal amount |  | $ 350,000 |  |  |  |  |
Foreign currency risk | Senior Notes due 2022 issued by Ferroglobe PLC |  |  |  |  |  |  |
Financial risk management |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 150,000 |  |
Liquidity risk |  |  |  |  |  |  |
Financial risk management |  |  |  |  |  |  |
Number of installments | item |  |  | 120 |  |  |  |
Liquidity risk | Senior Notes due 2022 |  |  |  |  |  |  |
Financial risk management |  |  |  |  |  |  |
Principal amount | $ 350,000 |  |  |  |  |  |
Fixed Interest Rate | 9.375% |  |  |  |  |  |
Redemption price of notes at change of control | 101.00% |  |  |  |  |  |
Liquidity risk | Amended revolving credit facility |  |  |  |  |  |  |
Financial risk management |  |  |  |  |  |  |
Principal amount | $ 200,000 |  |  |  |  |  |
Liquidity risk | Revolving Credit Facility |  |  |  |  |  |  |
Financial risk management |  |  |  |  |  |  |
Amount of borrowings utilized including letters of credit |  |  |  |  | $ 139,325 |  | $ 0
Grupo Villar Mir, S.A.U. |  |  |  |  |  |  |
Financial risk management |  |  |  |  |  |  |
Ownership interest as a percentage | 53.90% |  |  |  |  |  |
Minimum |  |  |  |  |  |  |
Financial risk management |  |  |  |  |  |  |
Change in percentage of voting stock held other than by permitted holders and its affiliates to occur change in control | 35.00% |  |  |  |  |  |
Maximum |  |  |  |  |  |  |
Financial risk management |  |  |  |  |  |  |
Threshold percentage of ownership interest held by related party lenders | 19.00% |  |  |  |  |  |
Threshold percentage of ownership interest held by purchaser after acquisition of lender shares | 15.00% |  |  |  |  |  |

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