SEGMENT INFORMATION - Capital Expenditures (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Segment information [Abstract]
Capital expenditures	$ 14,688	$ 7,700
Human Nutrition & Health | Operating Segments
Segment information [Abstract]
Capital expenditures	9,927	4,091
Animal Nutrition & Health | Operating Segments
Segment information [Abstract]
Capital expenditures	2,216	1,763
Specialty Products | Operating Segments
Segment information [Abstract]
Capital expenditures	2,164	1,202
Industrial Products | Operating Segments
Segment information [Abstract]
Capital expenditures	$ 381	$ 644