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Production Costs - Employee Compensation and Benefits Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Analysis of income and expense [abstract]    
NRV adjustments to inventory $ (400) $ 24,300
Wages, salaries and bonuses 288,015 181,957
Share-based compensation 4,448 2,957
Total employee compensation and benefit expenses 292,463 184,914
Less: Expensed within General and Administrative expenses (16,156) (13,919)
Less: Expensed within Exploration expenses (4,623) (3,116)
Employee compensation and benefits expenses included in production costs $ 271,684 $ 167,879