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Closure and Rehabilitation Provisions (Schedule of Closure and Rehabilitation Provisions) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of other provisions [line items]    
Current portion $ 1,656 $ 1,121
Other non-current procivions 12,577 $ 12,091
Provision for decommissioning, restoration and rehabilitation costs [member]    
Disclosure of other provisions [line items]    
Balance January 1, 2017 13,212  
Changes in estimate 910  
Incurred and charged against the provision (793)  
Accretion expense 684  
Effect of foreign exchange changes 220  
Balance December 31, 2017 14,233  
Current portion 1,656  
Other non-current procivions 12,577  
Caylloma M&I Property [member] | Provision for decommissioning, restoration and rehabilitation costs [member]    
Disclosure of other provisions [line items]    
Balance January 1, 2017 8,182  
Changes in estimate 1,761  
Incurred and charged against the provision (623)  
Accretion expense 304  
Balance December 31, 2017 9,624  
Current portion 1,533  
Other non-current procivions 8,091  
San Jose M&I Property [member] | Provision for decommissioning, restoration and rehabilitation costs [member]    
Disclosure of other provisions [line items]    
Balance January 1, 2017 4,822  
Changes in estimate (1,152)  
Incurred and charged against the provision (170)  
Accretion expense 380  
Effect of foreign exchange changes 220  
Balance December 31, 2017 4,100  
Current portion 123  
Other non-current procivions 3,977  
Lindero Project [member] | Provision for decommissioning, restoration and rehabilitation costs [member]    
Disclosure of other provisions [line items]    
Balance January 1, 2017 208  
Changes in estimate 301  
Balance December 31, 2017 509  
Other non-current procivions $ 509