SEGMENT INFORMATION - Business Segment Earnings Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment information [Abstract]
Earnings before income taxes	$ 27,907	$ 24,436	$ 78,370	$ 74,110
Interest and other (expense)	(1,121)	(1,594)	(3,853)	(4,802)
Other and Unallocated
Segment information [Abstract]
Earnings before income taxes	(830)	16	(5,735)	980
Human Nutrition & Health \| Operating Segments
Segment information [Abstract]
Earnings before income taxes	17,499	13,193	45,131	39,234
Animal Nutrition & Health \| Operating Segments
Segment information [Abstract]
Earnings before income taxes	7,011	6,122	21,485	16,423
Specialty Products \| Operating Segments
Segment information [Abstract]
Earnings before income taxes	$ 5,348	$ 6,699	$ 21,342	$ 22,275

Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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