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Sales (Schedule of Sales by Product and Geographical Area) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of geographical areas [line items]    
Sales to external customers $ 278,966 $ 257,187
Silver-gold concentrates    
Disclosure of geographical areas [line items]    
Sales to external customers 188,327 183,197
Silver-lead concentrates    
Disclosure of geographical areas [line items]    
Sales to external customers 43,055 39,936
Zinc concentrates    
Disclosure of geographical areas [line items]    
Sales to external customers 23,980 33,686
Gold Dore    
Disclosure of geographical areas [line items]    
Sales to external customers 20,297  
Provisional pricing adjustments    
Disclosure of geographical areas [line items]    
Sales to external customers 3,307 368
PERU    
Disclosure of geographical areas [line items]    
Sales to external customers 67,643 72,882
PERU | Silver-lead concentrates    
Disclosure of geographical areas [line items]    
Sales to external customers 43,055 39,936
PERU | Zinc concentrates    
Disclosure of geographical areas [line items]    
Sales to external customers 23,980 33,686
PERU | Provisional pricing adjustments    
Disclosure of geographical areas [line items]    
Sales to external customers 608  
Provisional pricing adjustment   (740)
MEXICO    
Disclosure of geographical areas [line items]    
Sales to external customers 191,026 184,305
MEXICO | Silver-gold concentrates    
Disclosure of geographical areas [line items]    
Sales to external customers 188,327 183,197
MEXICO | Provisional pricing adjustments    
Disclosure of geographical areas [line items]    
Sales to external customers 2,699 $ 1,108
ARGENTINA    
Disclosure of geographical areas [line items]    
Sales to external customers 20,297  
ARGENTINA | Gold Dore    
Disclosure of geographical areas [line items]    
Sales to external customers $ 20,297