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Derivative Financial Instruments (Derivatives And Hedging-Overall-Subsequent Measurement) (Details) (Not Designated as Hedging Instrument [Member], USD $)
In Thousands, unless otherwise specified |
12 Months Ended | |
|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative, Gain (Loss) on Derivative, Net | $ (7,277) | $ (37,811) |
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Sales [Member] | Commodity Contract [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative, Gain (Loss) on Derivative, Net | (6,189) | (36,959) |
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Operating Expenses [Member] | Commodity Contract [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative, Gain (Loss) on Derivative, Net | (3,770) | (2,055) |
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Cost of Sales [Member] | Butane Futures Agreements [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative, Gain (Loss) on Derivative, Net | $ 2,682 | $ 1,203 |