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Inventories (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of inventories [Line Items]    
Inventories $ 218,715 $ 237,329
Production costs 648,068 575,896
NRV adjustments to inventory 12,300 (42,800)
Inventories, at net realisable value 125,500 48,200
Concentrate [member]    
Disclosure of inventories [Line Items]    
Inventories 11,582 12,891
Stockpile ore [member]    
Disclosure of inventories [Line Items]    
Inventories 16,209 31,964
Non-current inventories 9,500 18,400
Stockpile ore [member] | Manantial Espejo mine [member]    
Disclosure of inventories [Line Items]    
Impairment charge 10,000  
Stockpile ore [member] | Manantial Espejo and Dolores mines [member]    
Disclosure of inventories [Line Items]    
Impairment charge   6,000
Heap leach and in process [member]    
Disclosure of inventories [Line Items]    
Inventories 108,509 109,705
Non-current inventories 74,300 65,200
Heap leach and in process [member] | Manantial Espejo mine [member]    
Disclosure of inventories [Line Items]    
Impairment charge   1,500
Heap leach and in process [member] | Manantial Espejo and Dolores mines [member]    
Disclosure of inventories [Line Items]    
Impairment charge 10,300  
Dore and finished [member]    
Disclosure of inventories [Line Items]    
Inventories 35,054 36,864
Dore and finished [member] | Manantial Espejo mine [member]    
Disclosure of inventories [Line Items]    
Impairment charge 2,900  
Dore and finished [member] | Manantial Espejo and Alamo Dorado mines [member]    
Disclosure of inventories [Line Items]    
Impairment charge   3,400
Materials and supplies [member]    
Disclosure of inventories [Line Items]    
Inventories $ 47,361 $ 45,905