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Management of Financial Risk (Schedule of Company's Liquidity Risk) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Other liabilities (note 18) $ 2,523 $ 499
Operating leases 31,703 37,792
Less than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Operating leases 7,367 9,313
Between one and five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Operating leases 10,209 13,521
More than five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Operating leases 14,127 14,958
Liquidity risk [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Trade and other payables 65,275 65,286
Debt 166,000 156,000
Income tax payable 23,808 12,400
Lease obligations 31,703 37,792
Other liabilities (note 18) 2,523 499
Capital commitments, Lindero 558 24,467
Provisions 40,350 33,365
Total financial liabilities 330,217 329,809
Liquidity risk [member] | Less than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Trade and other payables 65,275 65,286
Income tax payable 23,808 12,400
Lease obligations 7,367 9,313
Capital commitments, Lindero 558 24,467
Provisions 433 2,699
Total financial liabilities 97,441 114,165
Liquidity risk [member] | Later than one year and not later than three years [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 120,000 110,000
Lease obligations 6,166 9,424
Other liabilities (note 18) 2,523 499
Provisions 5,444 7,565
Total financial liabilities 134,133 127,488
Liquidity risk [member] | Later than three years and not later than five years [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 46,000 46,000
Lease obligations 4,043 4,097
Provisions 10,692 1,846
Total financial liabilities 60,735 51,943
Liquidity risk [member] | More than five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Lease obligations 14,127 14,958
Provisions 23,781 21,255
Total financial liabilities $ 37,908 $ 36,213