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Derivatives (Schedule of Fair Value of Derivative Assets and Liabilities) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Embedded Derivative, Fair Value, Liability | $ (70,800) |
Preferred Distribution Rate Reset Election | Other long-term liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Embedded Derivative, Fair Value, Liability | (70,810) | $ (52,372)
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 | 243 | 732
Derivative Asset, Fair Value, Gross Liability | (243) | (732)
Asset Derivatives | 0 | 0
Derivative Liability, Fair Value, Gross Liability | (505) | (2,114)
Derivative Liability, Fair Value, Gross Asset | 505 | 2,114
Liability Derivatives | 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 | 127 | 616
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 | 0 | 0
Designated as hedges under accounting rules | Commodity Derivatives | Current Assets - Other |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 670 | 1,022
Derivative Asset, Fair Value, Gross Liability | (670) | (1,022)
Asset Derivatives | 0 | 0
Derivative Liability, Fair Value, Gross Liability | (892) | (3,345)
Derivative Liability, Fair Value, Gross Asset | 892 | 3,073
Liability Derivatives | $ 0 | $ (272)

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