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Other Financial Liabilities (debt) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Categories of non-current financial liabilities [abstract]
Debt issuance costs	$ (4,126)	$ (3,803)
Sociedad Minera El Brocal S.A.A. [Member]
Categories of non-current financial liabilities [abstract]
Senior unsecured credit facility (a)	1,030,000	1,280,000
Debt issuance costs	(7,190)	(11,512)
Total Debt	$ 1,022,810	$ 1,268,488	$ 1,996,004

X

- Definition

The amount of Unsecured credit facility gross outstanding for the year.

+ References

No definition available.

+ Details

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X

- Definition

The amount of interest and other costs that an entity incurs in connection with the borrowing of funds.

+ References

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

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- Definition

The amount of financial liabilities that the entity does not separately disclose in the same statement or note. [Refer: Financial liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Details

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