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SEGMENT INFORMATION - Business Segment Earnings Before Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment information [Abstract] |  |  |  |
Earnings before income taxes | $ 30,019 | $ 25,973 | $ 60,002 | $ 50,463
Interest and other (expense) | (574) | (944) | (1,166) | (2,732)
Operating segments | Human Nutrition & Health |  |  |  |
Segment information [Abstract] |  |  |  |
Earnings before income taxes | 19,021 | 15,497 | 38,711 | 27,632
Operating segments | Animal Nutrition & Health |  |  |  |
Segment information [Abstract] |  |  |  |
Earnings before income taxes | 3,561 | 6,430 | 8,617 | 14,474
Operating segments | Specialty Products |  |  |  |
Segment information [Abstract] |  |  |  |
Earnings before income taxes | 9,729 | 8,008 | 16,918 | 15,994
Other and unallocated |  |  |  |
Segment information [Abstract] |  |  |  |
Earnings before income taxes | (1,718) | (3,018) | (3,078) | (4,905)
Interest and other expense |  |  |  |
Segment information [Abstract] |  |  |  |
Interest and other (expense) | $ (574) | $ (944) | $ (1,166) | $ (2,732)

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