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Supplemental Cashflow Information (Schedule of Changes in Liabilities Arising from Financing Activities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Amortization of discount $ 1,883 $ 2,081
Long-term borrowings [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities at beginning of period 119,850 109,430
Additions   65,000
Interest 845 420
Payments (32,288) (55,000)
Acquisition of Roxgold 31,711  
Transaction costs (3,036)  
Liabilities arising from financing activities at end of period 117,082 119,850
Convertible Debenture    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities at beginning of period 38,766 37,105
Interest 1,641 1,661
Liabilities arising from financing activities at end of period 40,407 38,766
Lease liabilities [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities at beginning of period 19,497 23,879
Additions 7,397 2,684
Interest 2,336 1,920
Payments (11,928) (8,438)
Terminations (1,203) (497)
Acquisition of Roxgold 13,597  
Foreign exchange (291) (51)
Liabilities arising from financing activities at end of period 29,405 19,497
Assets held to hedge liabilities arising from financing activities [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities at beginning of period 1,260 894
Additions 508 176
Interest 1,018 563
Payments (2,105) (560)
Change in fair value 777 187
Liabilities arising from financing activities at end of period $ 1,458 $ 1,260