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Fair Value Measurements (Schedule of Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Assets | $ 706,648 | $ 562,915
Liabilities | (143,064) | (139,764)
Level 1 of fair value hierarchy [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets, at fair value | 555 | 1,266
Level 2 of fair value hierarchy [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets, at fair value | 34,391 | 24,471
Financial liabilities, at fair value | (2,328) | (254)
Level 2 of fair value hierarchy [member] | Interest rate swap contract [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets, at fair value | 140 |
Financial liabilities, at fair value |  | (254)
Level 2 of fair value hierarchy [member] | Forward contract [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets, at fair value |  | 973
Metal Forward Sales Contracts [member] | Level 2 of fair value hierarchy [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities, at fair value | (2,328) |
Marketable Securites - Shares [member] | Level 1 of fair value hierarchy [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets, at fair value | 555 | 1,266
Marketable Securites - Warrants [member] | Level 2 of fair value hierarchy [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets, at fair value | 1 | 313
Trade Receivables Concentrate Sales [member] | Level 2 of fair value hierarchy [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets, at fair value | 34,250 | 23,185
At fair value [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Assets | 34,946 | 25,737
Liabilities | (2,328) |
Financial liabilities, at fair value |  | (254)
At fair value [member] | Interest rate swap contract [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets, at fair value | 140 |
Financial liabilities, at fair value |  | (254)
At fair value [member] | Forward contract [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Assets |  | 973
At fair value [member] | Financial assets available-for-sale, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Assets | 555 | 1,266
At fair value [member] | Financial assets at fair value through profit or loss, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Assets | 34,251 | 24,471
Liabilities | (2,328) |
At fair value [member] | Financial assets at fair value through profit or loss, category [member] | Forward contract [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Assets |  | 973
At fair value [member] | Financial assets at fair value through other comprehensive income, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Assets | 140 |
Liabilities |  | (254)
At fair value [member] | Financial assets at fair value through other comprehensive income, category [member] | Interest rate swap contract [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Assets | 140 |
Liabilities |  | (254)
At fair value [member] | Metal Forward Sales Contracts [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Liabilities | (2,328) |
At fair value [member] | Metal Forward Sales Contracts [member] | Financial assets at fair value through profit or loss, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Liabilities | (2,328) |
At fair value [member] | Marketable Securites - Shares [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Assets | 555 | 1,266
At fair value [member] | Marketable Securites - Shares [member] | Financial assets available-for-sale, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Assets | 555 | 1,266
At fair value [member] | Marketable Securites - Warrants [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Assets | 1 | 313
At fair value [member] | Marketable Securites - Warrants [member] | Financial assets at fair value through profit or loss, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Assets | 1 | 313
At fair value [member] | Trade Receivables Concentrate Sales [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Assets | 34,250 | 23,185
At fair value [member] | Trade Receivables Concentrate Sales [member] | Financial assets at fair value through profit or loss, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Assets | 34,250 | 23,185
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Assets | 213,825 | 123,656
Financial assets, at fair value | 213,825 | 123,656
Liabilities | (81,638) | (99,439)
Financial liabilities, at fair value | (30,047) | (46,413)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Other Liabilities [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Liabilities | (81,638) | (99,439)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Loans and receivables, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Assets | 213,825 | 123,656
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Level 2 of fair value hierarchy [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities, at fair value | (51,720) | (53,026)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Trade Payables [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Liabilities | (13,576) | (15,251)
Financial liabilities, at fair value | (13,576) | (15,251)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Trade Payables [member] | Other Liabilities [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Liabilities | (13,576) | (15,251)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Payroll Payable [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Liabilities | (13,894) | (10,755)
Financial liabilities, at fair value | (13,894) | (10,755)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Payroll Payable [member] | Other Liabilities [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Liabilities | (13,894) | (10,755)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Share Units Payable [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Liabilities | (11,720) | (13,026)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Share Units Payable [member] | Other Liabilities [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Liabilities | (11,720) | (13,026)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Share Units Payable [member] | Level 2 of fair value hierarchy [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities, at fair value | (11,720) | (13,026)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Finance Lease Obligations [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Liabilities | (906) | (3,034)
Financial liabilities, at fair value | (906) | (3,034)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Finance Lease Obligations [member] | Other Liabilities [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Liabilities | (906) | (3,034)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Bank Loan Payable [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Liabilities | (39,871) | (39,768)
Financial liabilities, at fair value |  | 232
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Bank Loan Payable [member] | Other Liabilities [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Liabilities | (39,871) | (39,768)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Bank Loan Payable [member] | Level 2 of fair value hierarchy [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities, at fair value | (40,000) | (40,000)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Other Payables [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Liabilities | (1,671) | (17,605)
Financial liabilities, at fair value | (1,671) | (17,605)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Other Payables [member] | Other Liabilities [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Liabilities | (1,671) | (17,605)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Cash and Cash Equivalent [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Assets | 183,074 | 82,484
Financial assets, at fair value | 183,074 | 82,484
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Cash and Cash Equivalent [member] | Loans and receivables, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Assets | 183,074 | 82,484
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Term Deposits [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Assets | 29,500 | 41,100
Financial assets, at fair value | 29,500 | 41,100
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Term Deposits [member] | Loans and receivables, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Assets | 29,500 | 41,100
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Other Receivables [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Assets | 1,251 | 72
Financial assets, at fair value | 1,251 | 72
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Other Receivables [member] | Loans and receivables, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Assets | $ 1,251 | $ 72

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