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Debt instruments (Details) - USD ($) $ in Thousands	Feb. 15, 2017	Dec. 31, 2018	Dec. 31, 2017
Debt Instruments
Amount due for settlement within 12 months		$ 10,937	$ 10,938
Amount due for settlement after 12 months		341,657	339,332
Total debt instruments		352,594	350,270
Senior Notes due 2022
Debt Instruments
Principal amount	$ 350,000	350,000	350,000
Unamortised issuance costs		(8,343)	(10,668)
Accrued coupon interest		10,937	10,938
Issuance costs	$ 12,116
Amount due for settlement within 12 months		10,937	10,938
Amount due for settlement after 12 months		341,657	339,332
Total debt instruments		352,594	350,270
Fixed Interest Rate	9.375%
Redemption price of notes	109.375%
Redemption price of notes at change of control	101.00%
Fair value of notes payable		$ 288,022	$ 378,000
Senior Notes due 2022 issued by Ferroglobe PLC
Debt Instruments
Principal amount	$ 150,000
Senior Notes due 2022 issued by Globe Specialty Metals, Inc
Debt Instruments
Principal amount	$ 200,000
Maximum | Senior Notes due 2022
Debt Instruments
Potential redemption of notes as a percentage of aggregate principal amount	35.00%
Grupo Villar Mir, S.A.U.
Debt Instruments
Ownership interest as a percentage	53.90%

X

- Definition

Amount of accrued coupon interest on debt instruments.

+ References

No definition available.

+ Details

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- Definition

Percentage price of original principal amount of debt at which the debt is required to be redeemed in the event of a change in control.

+ References

No definition available.

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- Definition

n/a

+ References

No definition available.

+ Details

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- Definition

The amount, before accumulated amortisation, of debt issuance costs.

+ References

No definition available.

+ Details

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

No definition available.

+ Details

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- Definition

Percentage of principal amount of debt that may be redeemed.

+ References

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

No definition available.

+ Details

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- Definition

Fair value portion of notes payable.

+ References

No definition available.

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- Definition

The percentage of ownership interest held by related party.

+ References

No definition available.

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- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The amount of current debt instruments issued. [Refer: Debt instruments issued]

+ References

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- Definition

The amount of instruments issued by the entity that represent indebtedness.

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- Definition

The amount of non-current debt instruments issued. [Refer: Debt instruments issued]

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- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

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