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Contingencies (Details)
$ in Thousands
 6 Months Ended 12 Months Ended
Sep. 30, 2017
lawsuit
Dec. 31, 2020
USD ($)
lawsuit
Dec. 31, 2019
USD ($)
Nov. 30, 2018
USD ($)
Disclosure of contingent liabilities [line items]        
Provision for decommissioning, restoration and rehabilitation costs   $ 235,100 $ 188,500  
Royalty expense   $ 27,494 26,721  
San Vicente mine [member] | COMIBOL [Member] | Bolivia        
Disclosure of contingent liabilities [line items]        
Participation fee   37.50%    
Royalty expense   $ 5,800 $ 5,100  
Tahoe Resources, Inc [member]        
Disclosure of contingent liabilities [line items]        
Number of purported class action lawsuits filed | lawsuit 3      
Number of class action suits after consolidation | lawsuit   1    
Republic Metals Corporation [Member]        
Disclosure of contingent liabilities [line items]        
Amount of metal in possession at time of bankruptcy       $ 4,900