SEGMENT INFORMATION - Business Segment Earnings Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment information [Abstract]
Earnings before income taxes	$ 25,973	$ 24,881	$ 50,463	$ 49,674
Interest and other (expense)	(944)	(1,521)	(2,732)	(3,208)
Other and Unallocated
Segment information [Abstract]
Earnings before income taxes	(3,018)	140	(4,905)	964
Human Nutrition & Health | Operating Segments
Segment information [Abstract]
Earnings before income taxes	15,497	12,338	27,632	26,041
Animal Nutrition & Health | Operating Segments
Segment information [Abstract]
Earnings before income taxes	6,430	5,045	14,474	10,301
Specialty Products | Operating Segments
Segment information [Abstract]
Earnings before income taxes	$ 8,008	$ 8,879	$ 15,994	$ 15,576