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Fixed Assets, Mineral Leaseholds, and Asset Retirement Obligations (Forecast of Accretion Expense) (Details) $ in Thousands | Jun. 30, 2021 USD ($)
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Fixed Assets And Asset Retirement Obligations [Abstract] |
Remainder of 2021 | $ 4,975
2022 | 9,384
2023 | 9,128
2024 | 9,783
2025 | $ 10,487

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- Definition Asset Retirement Obligation, Future Payments Due In Four Years + References No definition available. + Details
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