SEGMENT INFORMATION - Business Segment Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Segment information [Abstract]
Assets	$ 1,161,341	$ 1,155,682
Other and Unallocated
Segment information [Abstract]
Assets	101,701	95,021
Human Nutrition & Health | Operating Segments
Segment information [Abstract]
Assets	734,586	737,951
Animal Nutrition & Health | Operating Segments
Segment information [Abstract]
Assets	143,600	140,806
Specialty Products | Operating Segments
Segment information [Abstract]
Assets	$ 181,454	$ 181,904