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BUSINESS DESCRIPTION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | May 28, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 180,713 | $ 175,140 | $ 173,355 | $ 174,436 | $ 166,527 | $ 158,595 | $ 161,554 | $ 157,029 | $ 703,644 | $ 643,705 | $ 643,679 |
Goodwill impairment - see Note 6 |  |  |  |  |  |  |  |  | 1,228 |  |  |
Goodwill | 529,463 |  |  |  | 523,998 |  |  |  | 529,463 | 523,998 | 447,995 |
Currency swap | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of derivatives |  |  |  |  |  |  |  |  |  |  |  | $ 108,569
Interest rate swap | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of derivatives |  |  |  |  |  |  |  |  |  |  |  | $ 108,569
HNH |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 424,051 |  |  |  | $ 423,600 |  |  |  | $ 424,051 | 423,600 |  |
Impairment charges |  |  |  |  |  |  |  |  |  | $ 1,026 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | $ 338 |

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