SEGMENT INFORMATION - Business Segment Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Segment information [Abstract]
Assets	$ 1,162,112	$ 1,155,682
Other and Unallocated
Segment information [Abstract]
Assets	87,143	89,918
Human Nutrition & Health | Operating Segments
Segment information [Abstract]
Assets	741,742	739,030
Animal Nutrition & Health | Operating Segments
Segment information [Abstract]
Assets	150,766	142,247
Specialty Products | Operating Segments
Segment information [Abstract]
Assets	$ 182,461	$ 184,487