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Derivative Financial Instruments (Derivatives And Hedging-Nondesignated) (Details) (Not Designated as Hedging Instrument [Member], USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2014
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Dec. 31, 2013
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|---|---|---|
| Derivatives, Fair Value [Line Items] | ||
| Derivative Asset, Fair Value, Gross Asset | $ 18 | $ 430 |
| Derivative Liability, Fair Value, Gross Liability | 3,269 | 7,021 |
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NYMEX Commodity Contracts [Member] | Other Current Assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative Asset, Fair Value, Gross Asset | 0 | 48 |
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NYMEX Commodity Contracts [Member] | Other Current Liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Derivative Liability, Fair Value, Gross Liability | 3,217 | 7,021 |
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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 | 18 | 382 |
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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 | $ 52 | $ 0 |