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Fixed Assets and Mineral Leaseholds (Forecast of Accretion Expense) (Details) $ in Thousands | Jun. 30, 2018 USD ($)
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Fixed Assets And Asset Retirement Obligations [Abstract] |
Remainder of 2018 | $ 5,432
2019 | 9,877
2020 | 8,710
2021 | 9,302
2022 | $ 9,935

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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 Three 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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