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Financial Instruments And Risk Management (Summary Of Fair Value And Recognized Gains And Losses Of Derivative Instruments Not Designated As Hedging Instruments) (Details) (Commodity Contract [Member], USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2013
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Dec. 31, 2012
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Sep. 30, 2013
Accounts Receivable [Member]
Not Designated as Hedging Instrument [Member]
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Dec. 31, 2012
Accounts Receivable [Member]
Not Designated as Hedging Instrument [Member]
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Sep. 30, 2013
Accounts Payable [Member]
Not Designated as Hedging Instrument [Member]
|
Dec. 31, 2012
Accounts Payable [Member]
Not Designated as Hedging Instrument [Member]
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Sep. 30, 2013
Fuel And Ethanol Costs Of Goods Sold [Member]
Not Designated as Hedging Instrument [Member]
|
Sep. 30, 2012
Fuel And Ethanol Costs Of Goods Sold [Member]
Not Designated as Hedging Instrument [Member]
|
Sep. 30, 2013
Fuel And Ethanol Costs Of Goods Sold [Member]
Not Designated as Hedging Instrument [Member]
|
Sep. 30, 2012
Fuel And Ethanol Costs Of Goods Sold [Member]
Not Designated as Hedging Instrument [Member]
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| Derivative [Line Items] | ||||||||||
| Derivative contracts | $ 2,868 | $ 6,727 | $ 1,567 | $ 3,043 | ||||||
| Derivative contracts | 6,985 | 3,786 | 5,684 | 102 | ||||||
| Gain (Loss) | $ 4,281 | $ (40,241) | $ 2,905 | $ (37,978) | ||||||