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Fair Value of Financial Instruments (Fair Value of Derivative Instruments) (Details) (Commodity Contracts, Futures, Assets, USD $)
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Dec. 31, 2013
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Dec. 31, 2012
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Commodity Contracts | Futures | Assets
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| Derivatives, Fair Value [Line Items] | ||
| Derivatives not Accounted for as Hedging Instruments | $ 1,642,450 | $ 1,556,910 |