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BUSINESS DESCRIPTION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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