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SEGMENT INFORMATION - Business Segment Earnings Before Income Tax (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Earnings from operations									$ 127,502	$ 111,147	$ 102,553
Interest and other expense									(2,269)	(4,730)	(6,075)
Earnings before income tax expense	$ 33,146	$ 32,085	$ 30,019	$ 29,983	$ 28,047	$ 27,907	$ 25,973	$ 24,490	125,233	106,417	96,478
Other and Unallocated
Segment Reporting Information [Line Items]
Earnings from operations									(4,728)	(7,030)	(257)
Interest and other expense
Segment Reporting Information [Line Items]
Interest and other expense									(2,269)	(4,730)	(6,075)
Human Nutrition & Health \| Operating Segments
Segment Reporting Information [Line Items]
Earnings from operations									76,031	61,397	48,429
Animal Nutrition & Health \| Operating Segments
Segment Reporting Information [Line Items]
Earnings from operations									26,179	29,979	25,868
Specialty Products \| Operating Segments
Segment Reporting Information [Line Items]
Earnings from operations									$ 30,020	$ 26,801	$ 28,513