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Fixed Assets and Asset Retirement Obligations Fixed Assets and Asset Retirement Obligations (Forecast of Accretion Expense) (Details) $ in Thousands | Dec. 31, 2016 USD ($)
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Forecast of Future Accretion Expense [Abstract] |
2017 | $ 11,117
2018 | 9,408
2019 | 8,619
2020 | 9,176
2021 | $ 9,772

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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 Two 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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- Definition Asset Retirement Obligation, Future Payments Due in Five Years + References No definition available. + Details
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- Definition Forecast of Future Accretion Expense [Abstract] + References No definition available. + Details
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