SEGMENT INFORMATION - Business Segment Net Sales (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]
Net sales	$ 175,140	$ 158,595	$ 522,931	$ 477,178
Other and Unallocated
Segment information [Abstract]
Net sales	2,194	5,279	5,874	22,669
Human Nutrition & Health | Operating Segments
Segment information [Abstract]
Net sales	103,589	86,142	296,525	257,163
Animal Nutrition & Health | Operating Segments
Segment information [Abstract]
Net sales	46,354	42,286	141,339	129,127
Specialty Products | Operating Segments
Segment information [Abstract]
Net sales	$ 23,003	$ 24,888	$ 79,193	$ 68,219