SEGMENT INFORMATION - Business Segment Earnings Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment information [Abstract]
Earnings before income taxes	$ 24,490	$ 24,793
Interest and other (expense)	(1,788)	(1,687)
Human Nutrition & Health | Operating Segments
Segment information [Abstract]
Earnings before income taxes	12,135	13,703
Animal Nutrition & Health | Operating Segments
Segment information [Abstract]
Earnings before income taxes	8,044	5,256
Specialty Products | Operating Segments
Segment information [Abstract]
Earnings before income taxes	7,986	6,697
Specialty Products | Other and Unallocated
Segment information [Abstract]
Earnings before income taxes	$ (1,887)	$ 824