SEGMENT INFORMATION - Depreciation and Amortization (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment information [Abstract]
Depreciation and amortization	$ 11,753	$ 11,034	$ 33,485	$ 33,460
Amortization expense pertaining to capitalized costs	70	70	212	610
Unallocated
Segment information [Abstract]
Depreciation and amortization	138	0	157	0
Human Nutrition & Health | Operating Segments
Segment information [Abstract]
Depreciation and amortization	7,411	8,372	22,880	25,288
Animal Nutrition & Health | Operating Segments
Segment information [Abstract]
Depreciation and amortization	1,646	1,397	4,847	3,996
Specialty Products | Operating Segments
Segment information [Abstract]
Depreciation and amortization	2,372	1,019	4,983	3,039
Industrial Products | Operating Segments
Segment information [Abstract]
Depreciation and amortization	$ 116	$ 176	$ 406	$ 527