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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 |
3 Months Ended | |
|---|---|---|
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Mar. 31, 2014
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Mar. 31, 2013
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative, Gain (Loss) on Derivative, Net | $ 3,332 | $ (4,428) |
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NYMEX Commodity Contracts [Member] | Sales [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative, Gain (Loss) on Derivative, Net | 2,823 | (1,761) |
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NYMEX Commodity Contracts [Member] | Operating Expenses [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative, Gain (Loss) on Derivative, Net | 365 | (1,886) |
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Butane Futures Agreements [Member] | Cost of Sales [Member]
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative, Gain (Loss) on Derivative, Net | $ 144 | $ (781) |