SEGMENT INFORMATION - Business Segment Earnings Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment information [Abstract]
Operating income (loss)	$ 32,513	$ 29,028	$ 93,681	$ 82,223
Interest and other expense	(428)	(1,121)	(1,594)	(3,853)
Total	32,085	27,907	92,087	78,370
Operating segments | Human Nutrition & Health
Segment information [Abstract]
Operating income (loss)	19,801	17,499	58,512	45,131
Operating segments | Animal Nutrition & Health
Segment information [Abstract]
Operating income (loss)	7,442	7,011	16,059	21,485
Operating segments | Specialty Products
Segment information [Abstract]
Operating income (loss)	6,455	5,348	23,373	21,342
Other and unallocated
Segment information [Abstract]
Operating income (loss)	(1,185)	(830)	(4,263)	(5,735)
Interest and other expense
Segment information [Abstract]
Interest and other expense	$ (428)	$ (1,121)	$ (1,594)	$ (3,853)