SEGMENT INFORMATION - Business Segment Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Assets	$ 1,165,843	$ 1,155,682
Other and Unallocated
Segment Reporting Information [Line Items]
Assets	100,708	89,445
Human Nutrition & Health | Operating Segments
Segment Reporting Information [Line Items]
Assets	717,232	731,963
Animal Nutrition & Health | Operating Segments
Segment Reporting Information [Line Items]
Assets	157,454	144,524
Specialty Products | Operating Segments
Segment Reporting Information [Line Items]
Assets	$ 190,449	$ 189,750