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Production Costs - Employee Compensation and Benefits Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Analysis of income and expense [abstract]    
Wages, salaries and bonuses $ 317,668 $ 288,015
Share-based compensation 3,024 4,448
Total employee compensation and benefit expenses 320,692 292,463
Less: Expensed within Care and Maintenance expenses (37,695) 0
Less: Expensed within General and Administrative expenses (17,180) (16,156)
Less: Expensed within Exploration expenses (3,064) (4,623)
Employee compensation and benefits expenses included in production costs $ 262,753 $ 271,684