SEGMENT INFORMATION, Business Segment Net Sales (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment information [Abstract]
Net sales	$ 163,687	$ 147,082	$ 325,097	$ 284,810
Human Nutrition & Health [Member] | Reportable Segments [Member]
Segment information [Abstract]
Net sales	85,013	78,031	168,076	151,158
Animal Nutrition & Health [Member] | Reportable Segments [Member]
Segment information [Abstract]
Net sales	42,036	37,048	88,177	75,126
Specialty Products [Member] | Reportable Segments [Member]
Segment information [Abstract]
Net sales	22,864	20,759	40,604	39,549
Industrial Products [Member] | Reportable Segments [Member]
Segment information [Abstract]
Net sales	$ 13,774	$ 11,244	$ 28,240	$ 18,977