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Fixed Assets, Mineral Leaseholds, and Asset Retirement Obligations (Depreciation and Depletion Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Fixed Assets And Asset Retirement Obligations [Abstract]    
Depreciation expense $ 65,750 $ 62,702
Depletion expense $ 1,020 $ 912