BUSINESS DESCRIPTION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 523,998	$ 447,995
Goodwill as a result of the Acquisitions – see Note 2	432	77,392
Impact due to change in foreign exchange rates	6,261	(1,389)
Goodwill impairment - see Note 6	(1,228)
Goodwill, end of period	529,463	523,998
HNH
Goodwill [Roll Forward]
Goodwill, beginning of period	423,600
Goodwill, end of period	424,051	423,600
ANH
Goodwill [Roll Forward]
Goodwill, beginning of period	17,189
Goodwill, end of period	17,824	17,189
Specialty Products
Goodwill [Roll Forward]
Goodwill, beginning of period	81,981
Goodwill, end of period	87,539	81,981
Other and Unallocated
Goodwill [Roll Forward]
Goodwill, beginning of period	1,228
Goodwill, end of period	$ 49	$ 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.

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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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Amount of loss from the write-down of an asset representing the future economic benefits arising 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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