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Derivatives (Fair Value of Derivative Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Liability Derivatives: |  |  |
Preferred Distribution Rate Reset Election |  | $ (40,800) |
Embedded Derivative Financial Instruments | Other Long-Term Liabilities |  |  |
Liability Derivatives: |  |  |
Preferred Distribution Rate Reset Election | [1] | (40,840) | $ (45,209)
Not Designated As Hedging Instrument | Commodity Derivatives | Current Assets - Other |  |  |
Asset Derivatives: |  |  |
Gross amount of recognized assets |  | 3,431 | 505
Gross amount offset in the Consolidated Balance Sheets |  | (1,361) | (505)
Net amount of assets presented in the Consolidated Balance Sheets |  | 2,070 | 0
Liability Derivatives: |  |  |
Gross amount of recognized liabilities | [2] | (1,361) | (1,203)
Gross amount offset in the Consolidated Balance Sheets | [2] | 1,361 | 1,203
Net amount of liabilities presented in the Consolidated Balance Sheets |  | 0 | 0
Not Designated As Hedging Instrument | Swap | Current Assets - Other |  |  |
Asset Derivatives: |  |  |
Gross amount of recognized assets |  | 1,274 | 0
Not Designated As Hedging Instrument | Swap | Current Liabilities - Accrued Liabilities |  |  |
Liability Derivatives: |  |  |
Gross amount of recognized liabilities |  | (125) | 0
Designated as Hedging Instrument | Commodity Derivatives | Current Assets - Other |  |  |
Asset Derivatives: |  |  |
Gross amount of recognized assets |  | 469 | 54
Gross amount offset in the Consolidated Balance Sheets |  | (44) | (54)
Net amount of assets presented in the Consolidated Balance Sheets |  | 425 | 0
Liability Derivatives: |  |  |
Gross amount of recognized liabilities | [2] | (44) | (863)
Gross amount offset in the Consolidated Balance Sheets | [2] | 44 | 338
Net amount of liabilities presented in the Consolidated Balance Sheets |  | $ 0 | $ (525)
[1] | Refer to Note 12 and Note 20 for additional discussion surrounding the Preferred Distribution Rate Reset Election derivative.
[2] | These derivative liabilities have been funded with margin deposits recorded in our Consolidated Balance Sheets under Current Assets - Other.

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