SEGMENT INFORMATION - Business Segment Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Segment information [Abstract]
Assets	$ 1,173,606	$ 1,165,843
Operating segments | Human Nutrition & Health
Segment information [Abstract]
Assets	721,428	717,232
Operating segments | Animal Nutrition & Health
Segment information [Abstract]
Assets	156,597	157,454
Operating segments | Specialty Products
Segment information [Abstract]
Assets	194,140	190,449
Other and unallocated
Segment information [Abstract]
Assets	$ 101,441	$ 100,708