SEGMENT INFORMATION - Business Segment Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Segment information [Abstract]
Assets	$ 1,151,256	$ 1,155,682
Other and Unallocated
Segment information [Abstract]
Assets	91,737	95,021
Human Nutrition & Health | Operating Segments
Segment information [Abstract]
Assets	739,032	737,951
Animal Nutrition & Health | Operating Segments
Segment information [Abstract]
Assets	141,871	140,806
Specialty Products | Operating Segments
Segment information [Abstract]
Assets	$ 178,616	$ 181,904