SEGMENT INFORMATION - Business Segment Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Segment information [Abstract]
Assets	$ 1,169,215	$ 1,165,843
Other and Unallocated
Segment information [Abstract]
Assets	107,481	100,708
Human Nutrition & Health | Operating Segments
Segment information [Abstract]
Assets	727,869	717,232
Animal Nutrition & Health | Operating Segments
Segment information [Abstract]
Assets	151,773	157,454
Specialty Products | Operating Segments
Segment information [Abstract]
Assets	$ 182,092	$ 190,449