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Fixed Assets and Asset Retirement Obligations (Forecast of Accretion Expense to Asset Retirement Obligations) (Details) $ in Thousands | Dec. 31, 2018 USD ($)
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Forecast of Future Accretion Expense [Abstract] |
2019 | $ 9,928
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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- 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, Next Twelve Months + References No definition available. + Details
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