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Fixed Assets and Mineral Leaseholds (Forecast of Accretion Expense) (Details) $ in Thousands | Sep. 30, 2017 USD ($)
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Fixed Assets And Asset Retirement Obligations [Abstract] |
Remainder of 2017 | $ 2,741
2018 | 9,686
2019 | 8,782
2020 | 9,378
2021 | $ 10,014

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