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Derivatives (Schedule of Fair Value of Derivative Assets and Liabilities) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Embedded Derivative, Fair Value, Liability | $ (83,400) |
Preferred Distribution Rate Reset Election | Other long-term liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Embedded Derivative, Fair Value, Liability | (83,414) | $ (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 | 1,693 | 732
Derivative Asset, Fair Value, Gross Liability | (1,693) | (732)
Asset Derivatives | 0 | 0
Derivative Liability, Fair Value, Gross Liability | (3,315) | (2,114)
Derivative Liability, Fair Value, Gross Asset | 3,315 | 2,114
Liability Derivatives | 0 | 0
Not qualifying or not designated as hedges under accounting rules | Swaps | Current Assets - Other |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 0 | 616
Not qualifying or not designated as hedges under accounting rules | Swaps | Accrued Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Fair Value, Gross Liability | (55) | 0
Designated as hedges under accounting rules | Commodity Derivatives | Current Assets - Other |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 180 | 1,022
Derivative Asset, Fair Value, Gross Liability | (180) | (1,022)
Asset Derivatives | 0 | 0
Derivative Liability, Fair Value, Gross Liability | (499) | (3,345)
Derivative Liability, Fair Value, Gross Asset | 499 | 3,073
Liability Derivatives | $ 0 | $ (272)

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