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Production Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Production Costs [Line Items]    
Consumption of raw materials and consumables $ 284,215 $ 311,812
Employee compensation and benefits expense 262,753 271,684
Contractors and outside services 125,242 117,018
Utilities 39,242 41,674
Other expenses 18,198 74,469
Changes in inventories (32,978) 24,640
Production Costs 696,672 841,297
NRV adjustments to inventory (16,200) (400)
Tahoe Resources, Inc [member]    
Production Costs [Line Items]    
Fair value increases recognized on select Tahoe inventories $ 3,500 $ 43,400