SEGMENT INFORMATION - Depreciation/Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Depreciation/amortization	$ 51,281	$ 45,862	$ 44,666
Other and Unallocated
Segment Reporting Information [Line Items]
Depreciation/amortization	2,278	1,351	1,374
Human Nutrition & Health | Operating Segments
Segment Reporting Information [Line Items]
Depreciation/amortization	32,117	30,558	33,594
Animal Nutrition & Health | Operating Segments
Segment Reporting Information [Line Items]
Depreciation/amortization	7,187	6,552	5,606
Specialty Products | Operating Segments
Segment Reporting Information [Line Items]
Depreciation/amortization	$ 9,699	$ 7,401	$ 4,092