BUSINESS DESCRIPTION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 447,995	$ 441,361
Goodwill as a result of the Acquisitions – see Note 2	77,392	6,838
Impact due to change in foreign exchange rates	(1,389)	(204)
Goodwill, end of period	523,998	447,995
HNH
Goodwill [Roll Forward]
Goodwill, beginning of period	405,527
Goodwill, end of period	423,600	405,527
ANH
Goodwill [Roll Forward]
Goodwill, beginning of period	18,578
Goodwill, end of period	17,189	18,578
Specialty Products
Goodwill [Roll Forward]
Goodwill, beginning of period	22,662
Goodwill, end of period	81,981	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
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-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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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.

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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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