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SEGMENT INFORMATION, Depreciation Amortization (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment information [Abstract]        
Depreciation/Amortization $ 10,868 $ 10,628 $ 21,886 $ 21,837
Human Nutrition & Health [Member] | Reportable Segments [Member]        
Segment information [Abstract]        
Depreciation/Amortization 8,384 8,196 16,916 16,311
Animal Nutrition & Health [Member] | Reportable Segments [Member]        
Segment information [Abstract]        
Depreciation/Amortization 1,294 1,145 2,599 3,034
Specialty Products [Member] | Reportable Segments [Member]        
Segment information [Abstract]        
Depreciation/Amortization 1,010 1,023 2,020 2,039
Industrial Products [Member] | Reportable Segments [Member]        
Segment information [Abstract]        
Depreciation/Amortization $ 180 $ 264 $ 351 $ 453