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Derivative Financial Instruments (Derivatives And Hedging-Nondesignated) (Details) (Not Designated as Hedging Instrument [Member], USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2013
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Dec. 31, 2012
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|---|---|---|
| Derivatives, Fair Value [Line Items] | ||
| Derivative Asset, Fair Value, Gross Asset | $ 430 | $ 1,577 |
| Derivative Liability, Fair Value, Gross Liability | 7,021 | 9,181 |
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Commodity Contract [Member] | Other Current Assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative Asset, Fair Value, Gross Asset | 48 | 227 |
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Commodity Contract [Member] | Other Current Liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative Liability, Fair Value, Gross Liability | 7,021 | 8,954 |
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Butane Futures Agreements [Member] | Other Current Assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative Asset, Fair Value, Gross Asset | 382 | 1,350 |
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Butane Futures Agreements [Member] | Other Current Liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative Liability, Fair Value, Gross Liability | $ 0 | $ 227 |