SEGMENT INFORMATION - Business Segment Net Sales (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]
Net sales	$ 197,869	$ 175,140	$ 585,890	$ 522,931
Operating segments | Human Nutrition & Health
Segment information [Abstract]
Net sales	111,200	103,589	327,187	296,525
Operating segments | Animal Nutrition & Health
Segment information [Abstract]
Net sales	56,192	46,354	161,821	141,339
Operating segments | Specialty Products
Segment information [Abstract]
Net sales	27,615	23,003	89,645	79,193
Other and unallocated
Segment information [Abstract]
Net sales	$ 2,862	$ 2,194	$ 7,237	$ 5,874