BUSINESS DESCRIPTION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 441,361	$ 439,811
Goodwill as a result of the Acquisitions – see Note 2	6,838	1,550
Impact due to change in foreign exchange rates	(204)
Goodwill, end of period	447,995	441,361
Human Nutrition & Health
Goodwill [Roll Forward]
Goodwill, beginning of period	405,334
Goodwill, end of period	405,527	405,334
Animal Nutrition & Health
Goodwill [Roll Forward]
Goodwill, beginning of period	12,137
Goodwill, end of period	18,578	12,137
Specialty Products
Goodwill [Roll Forward]
Goodwill, beginning of period	22,662
Goodwill, end of period	22,662	22,662
Industrial Products
Goodwill [Roll Forward]
Goodwill, beginning of period	1,228
Goodwill, end of period	$ 1,228	$ 1,228

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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