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Derivatives (Schedule Of Fair Value Of Derivative Assets And Liabilities) (Details) - Other Current Assets [Member] - Total Commodity Derivatives [Member] - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Not Designated As Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 1,515 |  | $ 16,383
Derivative Asset, Fair Value, Gross Liability | (1,277) |  | (2,310)
Derivative Liability, Fair Value, Gross Liability | (1,277) | [1] | (2,310)
Derivative Liability, Fair Value, Gross Asset | 1,277 | [1] | 2,310
Derivative Liability | 0 |  | 0
Derivative Asset | 238 |  | 14,073
Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | 0 |  | 0
Derivative Asset, Fair Value, Gross Liability | 0 |  | 0
Derivative Liability, Fair Value, Gross Liability | (37) | [1] | 0
Derivative Liability, Fair Value, Gross Asset | 37 | [1] | 0
Derivative Liability | 0 |  | 0
Derivative Asset | $ 0 |  | $ 0
[1] | These derivative liabilities have been funded with margin deposits recorded in our Unaudited Condensed Consolidated Balance Sheets under Current Assets - Other.

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