SEGMENT INFORMATION - Business Segment Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Segment information [Abstract]
Assets	$ 1,098,320	$ 981,355
Unallocated
Segment information [Abstract]
Assets	44,878	59,473
Human Nutrition & Health | Operating Segments
Segment information [Abstract]
Assets	704,871	702,692
Animal Nutrition & Health | Operating Segments
Segment information [Abstract]
Assets	132,992	136,810
Specialty Products | Operating Segments
Segment information [Abstract]
Assets	193,659	59,558
Industrial Products | Operating Segments
Segment information [Abstract]
Assets	$ 21,920	$ 22,822