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Other Financial Liabilities (debt) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current debt:      
Lease liabilities (a) $ 3,692    
Non-current debt:      
Lease liabilities (a) 3,811    
Less : Debt issuance cost (3,124) $ (4,126)  
Total non-current financial liabilities 305,996 540,896  
Sociedad Minera El Brocal S.A.A. [Member]      
Current debt:      
Lease liabilities (a) 8,855    
Non-current debt:      
Senior unsecured credit facility (a) 830,000 1,030,000  
Lease liabilities (a) 76,944    
Less : Debt issuance cost (4,124) (7,190)  
Total non-current financial liabilities 902,820 1,022,810  
Total other financial liabilities $ 911,675 $ 1,022,810 $ 1,268,488