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Closure and Rehabilitation Provisions (Schedule of Estmates Used in Closure and Rehabilitation Provisions) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Provision for decommissioning, restoration and rehabilitation costs [member]  
Disclosure of other provisions [line items]  
Undiscounted estimated cash flow $ 15,186
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 2029
Caylloma M&I Property [member] | Provision for decommissioning, restoration and rehabilitation costs [member]  
Disclosure of other provisions [line items]  
Undiscounted estimated cash flow $ 9,726
Discount rate 3.76%
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 $ 5,016
Discount rate 7.22%
Inflation rate 3.87%
Lindero Project [member] | Bottom of range [member]  
Disclosure of other provisions [line items]  
Anticipated settlement date 2019
Lindero Project [member] | Top of range [member]  
Disclosure of other provisions [line items]  
Anticipated settlement date 2032
Lindero Project [member] | Provision for decommissioning, restoration and rehabilitation costs [member]  
Disclosure of other provisions [line items]  
Undiscounted estimated cash flow $ 444
Discount rate 5.91%
Inflation rate 6.58%