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SEGMENTS. (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Net Sales |  |  |  |  |  |  |  |  | $ 1,424,881 | $ 1,515,371
Cost of goods sold | $ 357,617 | $ 365,160 | $ 346,301 | $ 355,803 | $ 334,415 | $ 370,407 | $ 410,522 | $ 400,027 | 1,434,819 | 1,530,535
Income (loss) before benefit for income taxes |  |  |  |  |  |  |  |  | (101,302) | (68,498)
Depreciation |  |  |  |  |  |  |  |  | 47,909 | 40,849
Interest expense |  |  |  |  |  |  |  |  | 20,206 | 17,132
Intersegment eliminations [Member] |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | (9,520) | (10,768)
Cost of goods sold |  |  |  |  |  |  |  |  | (10,829) | (10,963)
Ethanol Production [Member] |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 1,070,877 | 1,158,496
Cost of goods sold |  |  |  |  |  |  |  |  | 1,095,742 | 1,197,507
Income (loss) before benefit for income taxes |  |  |  |  |  |  |  |  | (93,367) | (77,833)
Depreciation |  |  |  |  |  |  |  |  | 47,206 | 40,099
Interest expense |  |  |  |  |  |  |  |  | 7,569 | 7,116
Ethanol Production [Member] | Ethanol/alcohol sales [Member] |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 800,262 | 859,815
Ethanol Production [Member] | Co-product sales [Member] |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 268,996 | 296,686
Ethanol Production [Member] | Intersegment sales [Member] |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 1,619 | 1,995
Marketing and distribution [Member] |  |  |  |  |  |  |  |  |  |
Cost of goods sold |  |  |  |  |  |  |  |  | 349,906 | 343,991
Income (loss) before benefit for income taxes |  |  |  |  |  |  |  |  | 7,442 | 18,191
Interest expense |  |  |  |  |  |  |  |  | 3,053 | 1,388
Marketing and distribution [Member] | Ethanol/alcohol sales, gross [Member] |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 353,792 | 357,011
Marketing and distribution [Member] | Ethanol/alcohol sales, net [Member] |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 1,831 | 1,859
Marketing and distribution [Member] | Intersegment eliminations [Member] |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 7,901 | 8,773
Total marketing and distribution sales [Member] |  |  |  |  |  |  |  |  |  |
Net Sales |  |  |  |  |  |  |  |  | 363,524 | 367,643
Corporate activities [Member] |  |  |  |  |  |  |  |  |  |
Income (loss) before benefit for income taxes |  |  |  |  |  |  |  |  | (15,357) | (8,856)
Depreciation |  |  |  |  |  |  |  |  | 703 | 750
Interest expense |  |  |  |  |  |  |  |  | $ 9,584 | $ 8,628

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