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Earnings Per Share (Schedule Of Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income attributable to Green Plains	$ 42,237us-gaap_NetIncomeLoss	$ 41,749us-gaap_NetIncomeLoss	$ 32,314us-gaap_NetIncomeLoss	$ 43,203us-gaap_NetIncomeLoss	$ 25,461us-gaap_NetIncomeLoss	$ 9,410us-gaap_NetIncomeLoss	$ 5,965us-gaap_NetIncomeLoss	$ 2,555us-gaap_NetIncomeLoss	$ 159,504us-gaap_NetIncomeLoss	$ 43,391us-gaap_NetIncomeLoss	$ 11,779us-gaap_NetIncomeLoss
Weighted average shares outstanding - basic									36,467us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	30,183us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	30,296us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Income (loss) attributable to Green Plains stockholders - basic	$ 1.12us-gaap_EarningsPerShareBasic	$ 1.11us-gaap_EarningsPerShareBasic	$ 0.86us-gaap_EarningsPerShareBasic	$ 1.30us-gaap_EarningsPerShareBasic	$ 0.84us-gaap_EarningsPerShareBasic	$ 0.31us-gaap_EarningsPerShareBasic	$ 0.20us-gaap_EarningsPerShareBasic	$ 0.09us-gaap_EarningsPerShareBasic	$ 4.37us-gaap_EarningsPerShareBasic	$ 1.44us-gaap_EarningsPerShareBasic	$ 0.39us-gaap_EarningsPerShareBasic
Net income (loss) attributable to Green Plains on an as-if-converted basis									161,459us-gaap_NetIncomeLossAttributableToParentDiluted	48,442us-gaap_NetIncomeLossAttributableToParentDiluted	11,779us-gaap_NetIncomeLossAttributableToParentDiluted
Effect of dilutive stock-based compensation awards									217us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	211us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	167us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Total potential shares outstanding									40,730us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	38,304us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	30,463us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Income (loss) attributable to Green Plains stockholders - diluted	$ 1.07us-gaap_EarningsPerShareDiluted	$ 1.03us-gaap_EarningsPerShareDiluted	$ 0.82us-gaap_EarningsPerShareDiluted	$ 1.04us-gaap_EarningsPerShareDiluted	$ 0.65us-gaap_EarningsPerShareDiluted	$ 0.28us-gaap_EarningsPerShareDiluted	$ 0.19us-gaap_EarningsPerShareDiluted	$ 0.08us-gaap_EarningsPerShareDiluted	$ 3.96us-gaap_EarningsPerShareDiluted	$ 1.26us-gaap_EarningsPerShareDiluted	$ 0.39us-gaap_EarningsPerShareDiluted
5.75% Convertible Notes due 2015 [Member]
Interest and amortization on convertible debt, net of tax effect									576us-gaap_InterestOnConvertibleDebtNetOfTax / gpre_ConvertibleDebtAxis = gpre_ConvertibleNotesDue2015Member	3,578us-gaap_InterestOnConvertibleDebtNetOfTax / gpre_ConvertibleDebtAxis = gpre_ConvertibleNotesDue2015Member
Effect of dilutive convertible debt									1,006us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities / gpre_ConvertibleDebtAxis = gpre_ConvertibleNotesDue2015Member	6,286us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities / gpre_ConvertibleDebtAxis = gpre_ConvertibleNotesDue2015Member
3.25% Convertible Notes due 2018 [Member]
Interest and amortization on convertible debt, net of tax effect									$ 1,379us-gaap_InterestOnConvertibleDebtNetOfTax / gpre_ConvertibleDebtAxis = gpre_ConvertibleNotesDue2018Member	$ 1,473us-gaap_InterestOnConvertibleDebtNetOfTax / gpre_ConvertibleDebtAxis = gpre_ConvertibleNotesDue2018Member
Effect of dilutive convertible debt									3,040us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities / gpre_ConvertibleDebtAxis = gpre_ConvertibleNotesDue2018Member	1,624us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities / gpre_ConvertibleDebtAxis = gpre_ConvertibleNotesDue2018Member

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