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Fair Value Measurements (Schedule of Fair Value of Financial Instruments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items]    
Assets $ 936,065 $ 786,517
Liabilities 300,639 183,713
Financial liabilities (329,809) (270,357)
At fair value [member]    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items]    
Financial assets 33,642  
Financial assets, at fair value   30,778
Financial liabilities, at fair value (894)  
At fair value [member] | Fair value hedges [member]    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items]    
Financial liabilities (894)  
At fair value [member] | Financial liabilities at fair value through profit or loss, category [member]    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items]    
Financial assets, at fair value   224
At fair value [member] | Financial liabilities at fair value through profit or loss, category [member] | Fair value hedges [member]    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items]    
Financial assets   224
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 33,642  
Financial assets, at fair value   30,778
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 33,642 30,778
Financial liabilities, at fair value (894)  
At fair value [member] | Level 2 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member]    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items]    
Financial assets, at fair value   224
At fair value [member] | Interest rate swap liability [Member]    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items]    
Financial liabilities, at fair value (894)  
At fair value [member] | Interest rate swap liability [Member] | Fair value hedges [member]    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items]    
Financial liabilities (894)  
At fair value [member] | Interest rate swap liability [Member] | Financial liabilities at fair value through profit or loss, category [member]    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items]    
Financial assets, at fair value   224
At fair value [member] | Interest rate swap liability [Member] | Financial liabilities at fair value through profit or loss, category [member] | Fair value hedges [member]    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items]    
Financial assets   224
At fair value [member] | Interest rate swap liability [Member] | Level 2 of fair value hierarchy [member]    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items]    
Financial liabilities, at fair value (894)  
At fair value [member] | Interest rate swap liability [Member] | Level 2 of fair value hierarchy [member] | Financial liabilities at fair value through profit or loss, category [member]    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items]    
Financial assets, at fair value   224
At fair value [member] | Trade Receivables Concentrate Sales [member]    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items]    
Financial assets 33,642  
Financial assets, at fair value   28,132
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 33,642  
Financial assets, at fair value   28,132
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 33,642 28,132
At fair value [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] | Metal forward sales contract [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, at fair value   2,646
At fair value [member] | Metal forward sales contract [member] | Level 2 of fair value hierarchy [member]    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items]    
Financial assets, at fair value   2,646
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 85,823  
Liabilities 227,171  
Financial assets   166,506
Financial assets, at fair value 85,823 166,506
Financial liabilities (75,561) (43,225)
Financial liabilities, at fair value   (117,700)
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]    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items]    
Financial assets 85,823 166,506
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 liabilities (227,171) (117,700)
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]    
Liabilities 153,933  
Financial liabilities, at fair value   (75,173)
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 37,357  
Financial liabilities (37,357) (24,219)
Financial liabilities, at fair value   (24,219)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Trade Payables [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 liabilities (37,357) (24,219)
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 15,801  
Financial liabilities (15,801) (14,976)
Financial liabilities, at fair value   (14,976)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Payroll Payable [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 liabilities (15,801) (14,976)
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 5,075  
Financial liabilities, at fair value   (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 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 liabilities (5,075) (5,173)
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]    
Liabilities 5,075  
Financial liabilities, at fair value   (5,173)
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 109,430  
Financial liabilities, at fair value   (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 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 liabilities (109,430) (69,302)
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]    
Liabilities 110,000  
Financial liabilities, at fair value   (70,000)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Debentures [Member]    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items]    
Financial liabilities, at fair value (37,105)  
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Debentures [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 liabilities (37,105)  
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Debentures [Member] | Level 2 of fair value hierarchy [member]    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items]    
Financial liabilities, at fair value (38,858)  
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 22,403  
Financial liabilities (22,403) (4,030)
Financial liabilities, at fair value   (4,030)
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Other Payables [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 liabilities (22,403) (4,030)
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 83,404  
Financial assets   90,503
Financial assets, at fair value 83,404 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] | Financial assets at amortised cost, category [member]    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items]    
Financial assets 83,404 90,503
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Short term investments [Member]    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items]    
Financial assets   72,824
Financial assets, at fair value   72,824
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Short term investments [Member] | Financial assets at amortised cost, category [member]    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items]    
Financial assets   72,824
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 2,419  
Financial assets   3,179
Financial assets, at fair value 2,419 3,179
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]    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [line items]    
Financial assets $ 2,419 $ 3,179