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SEGMENT INFORMATION, Business Segment Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Segment information [Abstract]    
Assets $ 989,467 $ 963,636
Human Nutrition & Health [Member] | Reportable Segments [Member]    
Segment information [Abstract]    
Assets 718,103 719,010
Animal Nutrition & Health [Member] | Reportable Segments [Member]    
Segment information [Abstract]    
Assets 111,240 118,418
Specialty Products [Member] | Reportable Segments [Member]    
Segment information [Abstract]    
Assets 60,375 63,141
Industrial Products [Member] | Reportable Segments [Member]    
Segment information [Abstract]    
Assets 28,571 18,471
Other Unallocated [Member]    
Segment information [Abstract]    
Assets $ 71,178 $ 44,596