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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, 2015 USD ($)
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Forecast of Future Accretion Expense [Abstract] |
Asset Retirement Obligation, Future Payments Due, Next Twelve Months | $ 7,743
Asset Retirement Obligation, Future Payments Due In Two Years | 6,722
Asset Retirement Obligation, Future Payments Due In Three Years | 5,141
Asset Retirement Obligation, Future Payments Due In Four Years | 5,518
Asset Retirement Obligation, Future Payments Due in Five Years | $ 5,924

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