SEGMENT INFORMATION - Depreciation and Amortization (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment information [Abstract]
Depreciation and amortization	$ 12,099	$ 12,745	$ 24,463	$ 25,294
Operating segments | Human Nutrition & Health
Segment information [Abstract]
Depreciation and amortization	7,441	8,015	15,014	15,859
Operating segments | Animal Nutrition & Health
Segment information [Abstract]
Depreciation and amortization	1,816	1,793	3,580	3,548
Operating segments | Specialty Products
Segment information [Abstract]
Depreciation and amortization	2,085	2,372	4,354	4,764
Other and unallocated
Segment information [Abstract]
Depreciation and amortization	$ 757	$ 565	$ 1,515	$ 1,123