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Derivatives (Fair Value of Derivative Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Liability Derivatives: |  |
Preferred Distribution Rate Reset Election | $ (51,500) |
Embedded Derivative Financial Instruments | Other Long-Term Liabilities |  |
Liability Derivatives: |  |
Preferred Distribution Rate Reset Election | (51,515) | $ (40,840)
Not Designated As Hedging Instrument | Commodity Derivatives | Current Assets - Other |  |
Asset Derivatives: |  |
Gross amount of recognized assets | 207 | 3,431
Gross amount offset in the Consolidated Balance Sheets | (207) | (1,361)
Net amount of assets presented in the Consolidated Balance Sheets | 0 | 2,070
Liability Derivatives: |  |
Gross amount of recognized liabilities | (2,079) | (1,361)
Gross amount offset in the Consolidated Balance Sheets | 1,064 | 1,361
Net amount of liabilities presented in the Consolidated Balance Sheets | (1,015) | 0
Not Designated As Hedging Instrument | Swap | Current Assets - Other |  |
Asset Derivatives: |  |
Gross amount of recognized assets | 1,382 | 1,274
Not Designated As Hedging Instrument | Swap | Current Liabilities - Accrued Liabilities |  |
Liability Derivatives: |  |
Gross amount of recognized liabilities | 0 | (125)
Designated as Hedging Instrument | Commodity Derivatives | Current Assets - Other |  |
Asset Derivatives: |  |
Gross amount of recognized assets | 4 | 469
Gross amount offset in the Consolidated Balance Sheets | (4) | (44)
Net amount of assets presented in the Consolidated Balance Sheets | 0 | 425
Liability Derivatives: |  |
Gross amount of recognized liabilities | (50) | (44)
Gross amount offset in the Consolidated Balance Sheets | 50 | 44
Net amount of liabilities presented in the Consolidated Balance Sheets | $ 0 | $ 0

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