SEGMENT INFORMATION - Business Segment Earnings Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment information [Abstract]
Earnings before income taxes	$ 29,983	$ 24,490
Interest and other (expense)	(592)	(1,788)
Other and Unallocated
Segment information [Abstract]
Earnings before income taxes	(1,360)	(1,887)
Interest and other expense
Segment information [Abstract]
Interest and other (expense)	(592)	(1,788)
Human Nutrition & Health | Operating Segments
Segment information [Abstract]
Earnings before income taxes	19,690	12,135
Animal Nutrition & Health | Operating Segments
Segment information [Abstract]
Earnings before income taxes	5,056	8,044
Specialty Products | Operating Segments
Segment information [Abstract]
Earnings before income taxes	$ 7,189	$ 7,986