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Quarterly Financial Data (Schedule Of Quarterly Financial Information) (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 28, 2020 | Sep. 01, 2019 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | [1] | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  | $ 478,764,000 |  | $ 424,062,000 |  | $ 388,024,000 |  | $ 632,869,000 |  | $ 715,677,000 |  | $ 632,350,000 |  | $ 630,570,000 |  | $ 438,641,000 |  |  | $ 1,923,719,000 | $ 2,417,238,000 | $ 2,983,932,000
Cost of goods sold |  |  | 513,559,000 | [2] | 438,267,000 | [2] | 407,392,000 | [2] | 687,197,000 | [2] | 730,599,000 |  | 674,715,000 |  | 677,215,000 |  | 477,279,000 |  |  |  |  |
Operating income (loss) |  |  | (34,795,000) |  | (14,205,000) |  | (19,368,000) |  | (54,328,000) |  | (14,922,000) |  | (42,365,000) |  | (46,645,000) |  | (38,638,000) |  |  | (122,696,000) | (142,570,000) | 89,954,000
Other expense |  |  | (10,403,000) |  | (10,154,000) |  | (9,609,000) |  | (8,268,000) |  | (2,286,000) |  | (9,694,000) |  | (10,759,000) |  | (7,633,000) |  |  | (38,434,000) | (30,372,000) | (84,310,000)
Income tax benefit (expense) |  |  | 1,922,000 | [3] | (7,280,000) | [3] | 11,458,000 | [3] | 44,283,000 | [3] | (19,514,000) | [4] | 12,565,000 | [4] | 15,322,000 | [4] | 12,943,000 | [4] |  | 50,383,000 | 21,316,000 | 20,147,000
Net income (loss) from continuing operations including noncontrolling interest |  |  | (43,100,000) |  | (30,733,000) |  | (5,474,000) |  | (10,347,000) |  | (34,459,000) |  | (38,850,000) |  | (42,118,000) |  | (33,402,000) |  |  | (89,654,000) | (148,829,000) | 25,195,000
Net income from discontinued operations, net of income taxes |  |  |  |  |  |  |  |  |  |  |  |  | 3,359,000 |  | 1,939,000 |  | (4,469,000) |  |  |  | 829,000 | 11,539,000
Net loss attributable to Green Plains |  |  | $ (49,630,000) |  | $ (34,486,000) |  | $ (8,214,000) |  | $ (16,445,000) |  | $ (39,749,000) |  | $ (38,970,000) |  | $ (45,342,000) |  | $ (42,799,000) |  |  | $ (108,775,000) | $ (166,860,000) | $ 15,923,000
Basic and diluted earnings per share attributable to Green Plains |  |  | $ (1.43) | [3] | $ (1.00) | [3] | $ (0.24) | [3] | $ (0.47) | [3] |  |  |  |  |  |  |  |  |  | $ (3.14) | $ (4.38) | $ 0.39
Net income (loss) continuing operations - basic |  |  |  |  |  |  |  |  |  |  | $ (1.13) | [5] | $ (1.15) | [5] | $ (1.18) | [5] | $ (0.95) | [5] |  | (3.14) | (4.40) | 0.11
Net income from discontinued operations - basic |  |  |  |  |  |  |  |  |  |  |  |  | 0.09 | [5] | 0.05 | [5] | (0.11) | [5] |  |  | 0.02 | 0.28
Net loss attributable to Green Plains - basic |  |  |  |  |  |  |  |  |  |  | $ (1.13) | [5] | $ (1.06) | [5] | $ (1.13) | [5] | $ (1.06) | [5] |  | $ (3.14) | $ (4.38) | $ 0.39
Gain (loss) on disposal of assets |  |  |  |  | $ 2,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000.0 | $ (20,860,000) |  | $ 150,351,000
Goodwill, Impairment Loss |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 24,091,000 |  |
Recognition of valuation allowance |  |  | $ 8,500,000 |  |  |  |  |  |  |  | $ 25,900,000 |  |  |  |  |  |  |  |  |  |  |
Hereford Ethanol Plant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal of assets | $ 22,400,000 |  | (22,400,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Green Plains Cattle Company LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal of assets |  | $ 0 | $ (500,000) |  | $ 2,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | During the third quarter of 2020, the company identified an immaterial issue which resulted in the overstatement of both revenues and cost of goods sold within the agribusiness and energy services segment as previously reported for the three and six months ended June 30, 2020. The second quarter revenues and cost of goods sold reflected in the quarterly financial data have been revised to correct these amounts.
[2] | The fourth quarter of 2020 includes a pretax loss on sale of assets, net of $22.4 million related to the sale of the Hereford, Texas ethanol plant and a loss related to GPCC of $0.5 million. The third quarter of 2020 includes a gain of $2.0 million related to GPCC. The first quarter of 2020 includes a goodwill impairment charge of $24.1 million.
[3] | The fourth quarter of 2020 includes the recognition of a $8.5 million valuation allowance which impacted income tax expense.
[4] | The fourth quarter of 2019 includes the recognition of a $25.9 million valuation allowance which impacted income tax expense.
[5] | Basic and diluted earnings per share are calculated independently for each of the quarters presented. Accordingly, the sum of the quarterly earnings per share amounts may not agree with the total year.

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