SEGMENT INFORMATION, Business Segment Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Segment information [Abstract]
Assets	$ 967,989	$ 963,636
Human Nutrition & Health [Member] | Reportable Segments [Member]
Segment information [Abstract]
Assets	720,931	719,010
Animal Nutrition & Health [Member] | Reportable Segments [Member]
Segment information [Abstract]
Assets	115,399	118,418
Specialty Products [Member] | Reportable Segments [Member]
Segment information [Abstract]
Assets	63,527	63,141
Industrial Products [Member] | Reportable Segments [Member]
Segment information [Abstract]
Assets	21,751	18,471
Other Unallocated [Member]
Segment information [Abstract]
Assets	$ 46,381	$ 44,596