SEGMENT INFORMATION - Business Segment Net Sales (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment information [Abstract]
Net sales	$ 173,355	$ 161,554	$ 347,791	$ 318,583
Other and Unallocated
Segment information [Abstract]
Net sales	1,389	7,295	3,680	17,390
Human Nutrition & Health | Operating Segments
Segment information [Abstract]
Net sales	97,428	85,872	192,936	171,021
Animal Nutrition & Health | Operating Segments
Segment information [Abstract]
Net sales	46,344	43,480	94,985	86,841
Specialty Products | Operating Segments
Segment information [Abstract]
Net sales	$ 28,194	$ 24,907	$ 56,190	$ 43,331