SEGMENT INFORMATION, Business Segment Net Sales (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments [Abstract]
Net sales	$ 161,410	$ 137,728
Human Nutrition & Health [Member] | Reportable Segments [Member]
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments [Abstract]
Net sales	83,063	73,127
Animal Nutrition & Health [Member] | Reportable Segments [Member]
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments [Abstract]
Net sales	46,141	38,078
Specialty Products [Member] | Reportable Segments [Member]
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments [Abstract]
Net sales	17,740	18,790
Industrial Products [Member] | Reportable Segments [Member]
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments [Abstract]
Net sales	$ 14,466	$ 7,733