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Derivatives (Schedule of Fair Value of Derivative Assets and Liabilities) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Embedded Derivative, Fair Value, Liability | $ (42,200) |
Preferred Distribution Rate Reset Election | Other long-term liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Embedded Derivative, Fair Value, Liability | (42,183) | $ (40,840)
Not qualifying or not designated as hedges under accounting rules | Commodity Derivatives | Current Assets - Other |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 1,685 | 3,431
Derivative Asset, Fair Value, Gross Liability | (1,685) | (1,361)
Derivative Asset | 0 | 2,070
Derivative Liability, Fair Value, Gross Liability | (2,871) | (1,361)
Derivative Liability, Fair Value, Gross Asset | 2,871 | 1,361
Derivative Liability | 0 | 0
Not qualifying or not designated as hedges under accounting rules | Swap | Current Assets - Other |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 361 | 1,274
Not qualifying or not designated as hedges under accounting rules | Swap | Current Liabilities - Accrued Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Fair Value, Gross Liability | (186) | (125)
Designated as hedges under accounting rules | Commodity Derivatives | Current Assets - Other |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 161 | 469
Derivative Asset, Fair Value, Gross Liability | (161) | (44)
Derivative Asset | 0 | 425
Derivative Liability, Fair Value, Gross Liability | (7) | (44)
Derivative Liability, Fair Value, Gross Asset | 7 | 44
Derivative Liability | $ 0 | $ 0

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