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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Net after-tax gain (loss) included in accumulated other comprehensive earnings | $ 230 | $ (147) | $ 1,039 | $ 603 |
Cross Currency Swap Contract | Derivatives in Cash Flow Hedging Relationships |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Amount hedged |  |  |  |  | $ 280,000
Net after-tax gain (loss) included in accumulated other comprehensive earnings |  |  | (300) |  |
Cash flow hedge derivative instrument liability at fair value | 700 |  | 700 |  |
Interest Rate Swap | Derivatives in Cash Flow Hedging Relationships |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Gain (loss) expected to be recognized in earnings in next twelve months related to cross currency swap contract | $ 8 |  | $ 8 |  |
Notes payable |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Proceeds from debt |  |  |  |  | $ 280,000
Interest rate on notes (as a percent) | 1.36% |  | 1.36% |  | 1.36%

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