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Fair Value Measurements (Schedule of Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets, at fair value |  | $ 213,825
At fair value [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets | $ 30,554 | 34,946
Financial liabilities |  | (2,328)
At fair value [member] | Interest rate swap contract [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets | (224) | 140
At fair value [member] | Forward contract [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities |  | (2,328)
At fair value [member] | Metal forward sales contract [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets | 2,646 |
At fair value [member] | Financial assets available-for-sale, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets |  | 555
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] |  |
Financial assets | 30,778 | 34,251
At fair value [member] | Financial assets at fair value through profit or loss, category [member] | Metal forward sales contract [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets | 2,646 |
At fair value [member] | Financial assets at fair value through profit or loss, category [member] | Financial liabilities at fair value through profit or loss, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities |  | (2,328)
At fair value [member] | Financial assets at fair value through profit or loss, category [member] | Financial liabilities at fair value through profit or loss, category [member] | Forward contract [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities |  | (2,328)
At fair value [member] | Financial assets at fair value hedging, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets | (224) | 140
At fair value [member] | Financial assets at fair value hedging, category [member] | Interest rate swap contract [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets | (224) | 140
At fair value [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
At fair value [member] | Level 2 of fair value hierarchy [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets, at fair value | 30,554 | 34,391
Financial liabilities, at fair value |  | (2,328)
At fair value [member] | 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 | (224) | 140
At fair value [member] | Level 2 of fair value hierarchy [member] | Forward contract [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities, at fair value |  | (2,328)
At fair value [member] | Level 2 of fair value hierarchy [member] | Metal forward sales contract [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets, at fair value | 2,646 |
At fair value [member] | Marketable Securities - Shares [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets |  | 555
At fair value [member] | Marketable Securities - Shares [member] | Financial assets available-for-sale, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets |  | 555
At fair value [member] | Marketable Securities - 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
At fair value [member] | Marketable Securities - Warrants [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets |  | 1
At fair value [member] | Marketable Securities - Warrants [member] | Financial assets at fair value through profit or loss, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets |  | 1
At fair value [member] | Marketable Securities - 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
At fair value [member] | Trade Receivables Concentrate Sales [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets | 28,132 | 34,250
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] |  |
Financial assets | 28,132 | 34,250
At fair value [member] | 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 | 28,132 | 34,250
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] |  |
Financial assets | 93,682 | 213,825
Financial assets, at fair value | 93,682 |
Financial liabilities | (126,466) | (81,638)
Financial liabilities, at fair value | (51,991) | (30,047)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Financial liabilities at amortised cost, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities | (126,466) |
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Financial other liabilities, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities |  | (81,638)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Financial assets at amortised cost, category [member] | Financial liabilities at amortised cost, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets | 93,682 |
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 | (75,173) | (51,720)
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] |  |
Financial liabilities | (24,219) | (13,576)
Financial liabilities, at fair value | (24,219) | (13,576)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Trade Payables [member] | Financial liabilities at amortised cost, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities | (24,219) |
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Trade Payables [member] | Financial other liabilities, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities |  | (13,576)
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] |  |
Financial liabilities | (14,976) | (13,894)
Financial liabilities, at fair value | (14,976) | (13,894)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Payroll Payable [member] | Financial liabilities at amortised cost, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities | (14,976) |
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Payroll Payable [member] | Financial other liabilities, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities |  | (13,894)
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] |  |
Financial liabilities | (5,173) | (11,720)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Share Units Payable [member] | Financial liabilities at amortised cost, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities | (5,173) |
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Share Units Payable [member] | Financial other liabilities, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities |  | (11,720)
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 | (5,173) | (11,720)
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] |  |
Financial liabilities | (8,766) | (906)
Financial liabilities, at fair value | (8,766) | (906)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Finance Lease Obligations [member] | Financial liabilities at amortised cost, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities | (8,766) |
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Finance Lease Obligations [member] | Financial other liabilities, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities |  | (906)
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] |  |
Financial liabilities | (69,302) | (39,871)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Bank Loan Payable [member] | Financial liabilities at amortised cost, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities | (69,302) |
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Bank Loan Payable [member] | Financial other liabilities, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities |  | (39,871)
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 | (70,000) | (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] |  |
Financial liabilities | (4,030) | (1,671)
Financial liabilities, at fair value | (4,030) | (1,671)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Other Payables [member] | Financial liabilities at amortised cost, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities | (4,030) |
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Other Payables [member] | Financial other liabilities, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial liabilities |  | (1,671)
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] |  |
Financial assets | 90,503 | 183,074
Financial assets, at fair value | 90,503 | 183,074
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Cash and Cash Equivalent [member] | Financial assets at amortised cost, category [member] | Financial liabilities at amortised cost, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets | 90,503 |
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] |  |
Financial assets |  | 183,074
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] |  |
Financial assets |  | 29,500
Financial assets, at fair value |  | 29,500
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] |  |
Financial assets |  | 29,500
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] |  |
Financial assets | 3,179 | 1,251
Financial assets, at fair value | 3,179 | 1,251
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Other Receivables [member] | Financial assets at amortised cost, category [member] | Financial liabilities at amortised cost, category [member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items] |  |
Financial assets | $ 3,179 |
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] |  |
Financial assets |  | $ 1,251

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35H&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35I&doctype=Standard -URIDate 2017-03-09 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35M&doctype=Standard -URIDate 2017-03-09 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35N&doctype=Standard -URIDate 2017-03-09 + Details
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