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Fixed Assets, Mineral Leaseholds, and Asset Retirement Obligations (Forecast of Accretion Expense) (Details) $ in Thousands | Mar. 31, 2019 USD ($)
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Fixed Assets And Asset Retirement Obligations [Abstract] |
Remainder of 2019 | $ 7,660
2020 | 10,997
2021 | 9,313
2022 | 9,892
2023 | $ 10,586

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