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Closure and Reclamation Provisions (Schedule of Estimates Used in Closure and Rehabilitation Provisions) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Provision for decommissioning, restoration and rehabilitation costs [member]  
Disclosure of other provisions [line items]  
Undiscounted estimated cash flow $ 33,365
Caylloma M&I Property [member] | Bottom of range [member]  
Disclosure of other provisions [line items]  
Anticipated settlement date 2022
Caylloma M&I Property [member] | Top of range [member]  
Disclosure of other provisions [line items]  
Anticipated settlement date 2027
Caylloma M&I Property [member] | Provision for decommissioning, restoration and rehabilitation costs [member]  
Disclosure of other provisions [line items]  
Undiscounted estimated cash flow $ 11,095
Estimated life of mine (years) 10 years
Discount rate 3.00%
Inflation rate 2.00%
San Jose M&I Property [member] | Bottom of range [member]  
Disclosure of other provisions [line items]  
Anticipated settlement date 2025
San Jose M&I Property [member] | Top of range [member]  
Disclosure of other provisions [line items]  
Anticipated settlement date 2037
San Jose M&I Property [member] | Provision for decommissioning, restoration and rehabilitation costs [member]  
Disclosure of other provisions [line items]  
Undiscounted estimated cash flow $ 4,850
Estimated life of mine (years) 6 years
Discount rate 6.88%
Inflation rate 3.58%
Lindero Project [member] | Bottom of range [member]  
Disclosure of other provisions [line items]  
Anticipated settlement date 2029
Lindero Project [member] | Top of range [member]  
Disclosure of other provisions [line items]  
Anticipated settlement date 2042
Lindero Project [member] | Provision for decommissioning, restoration and rehabilitation costs [member]  
Disclosure of other provisions [line items]  
Undiscounted estimated cash flow $ 17,420
Estimated life of mine (years) 14 years
Discount rate 1.94%
Inflation rate 2.00%