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Derivative Financial Instruments (Schedule Of Fair Values Of Derivative Financial Instruments) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Fair value of derivative asset $ 11,862,000us-gaap_DerivativeFairValueOfDerivativeAsset [1] $ (28,466,000)us-gaap_DerivativeFairValueOfDerivativeAsset [2]
Fair value of derivative liability 28,082,000us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral 4,612,000us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
Margin deposit asset 24,500,000us-gaap_MarginDepositAssets 77,100,000us-gaap_MarginDepositAssets
Net unrealized gains or losses on cash flow hedges (600,000)us-gaap_UnrealizedGainLossOnCashFlowHedgingInstruments (47,100,000)us-gaap_UnrealizedGainLossOnCashFlowHedgingInstruments
Derivative Financial Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of derivative asset 11,859,000us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= gpre_DerivativeFinancialInstrumentsMember		 [1],[3] (28,466,000)us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= gpre_DerivativeFinancialInstrumentsMember		 [2],[3]
Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of derivative asset 3,000us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember		 [1]  
Accrued And Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of derivative asset    [1]  
Fair value of derivative liability $ 28,082,000us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember		 $ 4,612,000us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
[1] Balance at December 31, 2014, includes $0.6 million of net unrealized losses on derivative financial instruments designated as cash flow hedging instruments.
[2] Balance at December 31, 2013, includes $47.1 million of net unrealized losses on derivative financial instruments designated as cash flow hedging instruments.
[3] Derivative financial instruments as reflected on the balance sheet include a margin deposit assets of $24.5 million and $77.1 million at December 31, 2014 and 2013, respectively.