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Fair Value of Financial Instruments (Fair Value of Derivative Instruments) (Details) (Commodity Contracts, Futures, Assets, USD $)	Mar. 31, 2015	Dec. 31, 2014
Commodity Contracts | Futures | Assets
Derivatives, Fair Value [Line Items]
Derivatives not Accounted for as Hedging Instruments	$ (15,855,783)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AssetsTotalMember / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember	$ (17,096,060)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AssetsTotalMember / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember

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- Definition

Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959

+ Details

Name:	us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

Name:	us-gaap_DerivativesFairValueLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration