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Schedule I - Condensed Financial Information Of The Registrant (Condensed Financial Information Of The Registrant Statements Of Balance Sheet - Parent Company Only) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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Current assets |  |  |  |
Cash and cash equivalents | $ 425,510 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 272,027 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 254,289 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 174,988 us-gaap_CashAndCashEquivalentsAtCarryingValue
Restricted cash | 29,742 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue | 26,994 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue |  |
Accounts receivable, including amounts from related parties of $196 and $69, respectively | 138,073 us-gaap_AccountsReceivableNetCurrent | 106,808 us-gaap_AccountsReceivableNetCurrent |  |
Prepaid expenses and other | 18,776 us-gaap_PrepaidExpenseAndOtherAssetsCurrent | 12,893 us-gaap_PrepaidExpenseAndOtherAssetsCurrent |  |
Total current assets | 910,910 us-gaap_AssetsCurrent | 633,305 us-gaap_AssetsCurrent |  |
Property and equipment, net | 825,210 us-gaap_PropertyPlantAndEquipmentNet | 806,046 us-gaap_PropertyPlantAndEquipmentNet |  |
Other assets | 51,560 us-gaap_OtherAssetsNoncurrent | 51,817 us-gaap_OtherAssetsNoncurrent |  |
Total assets | 1,828,557 us-gaap_Assets | 1,532,045 us-gaap_Assets |  |
Current liabilities |  |  |  |
Accounts payable | 170,199 us-gaap_AccountsPayableCurrent | 112,001 us-gaap_AccountsPayableCurrent |  |
Accrued liabilities | 61,118 us-gaap_AccruedLiabilitiesCurrent | 37,949 us-gaap_AccruedLiabilitiesCurrent |  |
Current maturities of long-term debt | 63,465 us-gaap_LongTermDebtCurrent | 82,933 us-gaap_LongTermDebtCurrent |  |
Total current liabilities | 511,540 us-gaap_LiabilitiesCurrent | 409,197 us-gaap_LiabilitiesCurrent |  |
Long-term debt | 399,440 us-gaap_LongTermDebtNoncurrent | 480,746 us-gaap_LongTermDebtNoncurrent |  |
Deferred Tax Liabilities, Noncurrent | 115,235 us-gaap_DeferredTaxLiabilitiesNoncurrent | 91,294 us-gaap_DeferredTaxLiabilitiesNoncurrent |  |
Other liabilities | 4,893 us-gaap_OtherLiabilitiesNoncurrent | 5,450 us-gaap_OtherLiabilitiesNoncurrent |  |
Total liabilities | 1,031,108 us-gaap_Liabilities | 986,687 us-gaap_Liabilities |  |
Stockholders’ equity |  |  |  |
Common stock | 45 us-gaap_CommonStockValue | 38 us-gaap_CommonStockValue |  |
Additional paid-in capital | 569,431 us-gaap_AdditionalPaidInCapitalCommonStock | 468,962 us-gaap_AdditionalPaidInCapitalCommonStock |  |
Retained earnings | 299,101 us-gaap_RetainedEarningsAccumulatedDeficit | 148,505 us-gaap_RetainedEarningsAccumulatedDeficit |  |
Accumulated other comprehensive loss | (5,320)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (6,339)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |
Treasury stock | (65,808)us-gaap_TreasuryStockValue | (65,808)us-gaap_TreasuryStockValue |  |
Total stockholders' equity | 797,449 us-gaap_StockholdersEquity | 545,358 us-gaap_StockholdersEquity |  |
Total liabilities and stockholders’ equity | 1,828,557 us-gaap_LiabilitiesAndStockholdersEquity | 1,532,045 us-gaap_LiabilitiesAndStockholdersEquity |  |
Green Plains Inc. [Member] |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 252,689 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 143,852 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 100,051 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 71,547 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Restricted cash | 6,309 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Accounts receivable, including amounts from related parties of $196 and $69, respectively | 268 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 128 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Prepaid expenses and other | 893 us-gaap_PrepaidExpenseAndOtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 860 us-gaap_PrepaidExpenseAndOtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Due from subsidiaries | 30,823 gpre_DueFromSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 20,987 gpre_DueFromSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total current assets | 290,982 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 165,827 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Property and equipment, net | 4,147 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,052 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Investment in consolidated subsidiaries | 611,311 gpre_InvestmentInConsolidatedSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 568,410 gpre_InvestmentInConsolidatedSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other assets | 18,323 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 19,374 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total assets | 924,763 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 756,663 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Current liabilities |  |  |  |
Accounts payable | 2,098 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,310 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accrued liabilities | 20,057 us-gaap_AccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 14,344 us-gaap_AccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Current maturities of long-term debt |  | 188 us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total current liabilities | 22,155 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 18,842 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Long-term debt | 100,845 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 186,654 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Deferred Tax Liabilities, Noncurrent | 4,010 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5,446 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other liabilities | 304 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 363 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities | 127,314 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 211,305 us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Stockholders’ equity |  |  |  |
Common stock | 45 us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 38 us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Additional paid-in capital | 569,431 us-gaap_AdditionalPaidInCapitalCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 468,962 us-gaap_AdditionalPaidInCapitalCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Retained earnings | 299,101 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 148,505 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accumulated other comprehensive loss | (5,320)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (6,339)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Treasury stock | (65,808)us-gaap_TreasuryStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (65,808)us-gaap_TreasuryStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total stockholders' equity | 797,449 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 545,358 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities and stockholders’ equity | 924,763 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 756,663 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accounts receivable, amounts from related parties | $ 196 us-gaap_AccountsReceivableRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 69 us-gaap_AccountsReceivableRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |

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