SEGMENT INFORMATION - Depreciation and Amortization (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment information [Abstract]
Depreciation/Amortization	$ 10,825	$ 10,868	$ 21,590	$ 21,886
Unallocated
Segment information [Abstract]
Depreciation/Amortization	10	0	19	0
Human Nutrition & Health | Operating Segments
Segment information [Abstract]
Depreciation/Amortization	7,483	8,384	15,469	16,916
Animal Nutrition & Health | Operating Segments
Segment information [Abstract]
Depreciation/Amortization	1,623	1,294	3,201	2,599
Specialty Products | Operating Segments
Segment information [Abstract]
Depreciation/Amortization	1,590	1,010	2,611	2,020
Industrial Products | Operating Segments
Segment information [Abstract]
Depreciation/Amortization	$ 119	$ 180	$ 290	$ 351