SEGMENT INFORMATION - Capital Expenditures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment information [Abstract]
Capital expenditures			$ 21,568	$ 19,279
Amortization of identifiable intangible assets	$ 6,155	$ 6,911	18,868	20,875
Operating segments | Human Nutrition & Health
Segment information [Abstract]
Capital expenditures			14,492	13,481
Operating segments | Animal Nutrition & Health
Segment information [Abstract]
Capital expenditures			4,557	3,958
Operating segments | Specialty Products
Segment information [Abstract]
Capital expenditures			2,281	1,542
Other and unallocated
Segment information [Abstract]
Capital expenditures			238	298
Transaction and integration costs, ERP implementation costs, and unallocated legal fees	305	161	1,005	2,179
Amortization of identifiable intangible assets	$ 675	$ 470	$ 2,024	$ 1,417