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Derivatives (Fair Value of Derivative Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Liability Derivatives: |  |  |
Preferred Distribution Rate Reset Election |  | $ (45,200) |
Current Assets-Other [Member] |  |  |
Asset Derivatives: |  |  |
Total asset derivatives |  | 0 | $ 0
Embedded Derivative Financial Instruments [Member] | Other Noncurrent Liabilities [Member] |  |  |
Liability Derivatives: |  |  |
Preferred Distribution Rate Reset Election | [1] | (45,209) | 0
Not Designated As Hedging Instrument [Member] | Commodity Derivatives [Member] | Current Assets-Other [Member] |  |  |
Asset Derivatives: |  |  |
Gross amount of recognized assets |  | 505 | 443
Gross amount offset in the Consolidated Balance Sheets |  | (505) | (443)
Net amount of assets presented in the Consolidated Balance Sheets |  | 0 | 0
Liability Derivatives: |  |  |
Gross amount of recognized liabilities | [2] | (1,203) | (1,772)
Gross amount offset in the Consolidated Balance Sheets | [2] | 1,203 | 1,772
Net amount of liabilities presented in the Consolidated Balance Sheets |  | 0 | 0
Designated as Hedging Instrument [Member] | Commodity Derivatives [Member] | Current Assets-Other [Member] |  |  |
Asset Derivatives: |  |  |
Gross amount of recognized assets |  | 54 | 3,321
Gross amount offset in the Consolidated Balance Sheets |  | (54) | (3,321)
Net amount of assets presented in the Consolidated Balance Sheets |  | 0 | 0
Liability Derivatives: |  |  |
Gross amount of recognized liabilities | [2] | (863) | (9,506)
Gross amount offset in the Consolidated Balance Sheets | [2] | 338 | 7,589
Net amount of liabilities presented in the Consolidated Balance Sheets |  | $ (525) | $ (1,917)
[1] | Refer to Note 11 and Note 19 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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