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Fixed Assets, Mineral Leaseholds, and Asset Retirement Obligations (Forecast of Accretion Expense) (Details) $ in Thousands | Sep. 30, 2020 USD ($)
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Fixed Assets And Asset Retirement Obligations [Abstract] |
Remainder of 2020 | $ 2,619
2021 | 9,493
2022 | 9,513
2023 | 10,183
2024 | $ 10,900

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