SEGMENT INFORMATION - Depreciation Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Depreciation/Amortization	$ 43,905	$ 45,676	$ 39,362
Human Nutrition & Health [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Depreciation/Amortization	33,384	33,796	30,537
Animal Nutrition & Health [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Depreciation/Amortization	5,618	7,243	6,573
Specialty Products [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Depreciation/Amortization	4,097	3,787	1,225
Industrial Products [Member] | Reportable Segments [Member]
Segment Reporting Information [Line Items]
Depreciation/Amortization	$ 806	$ 850	$ 1,027