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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Net after-tax gain (loss) included in accumulated other comprehensive earnings | $ 289 | $ (733) | $ 809 | $ 750 |
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 |  |  | (600) |  |
Cash flow hedge derivative instrument liability at fair value | 4,100 |  | 4,100 |  |
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 | $ 800 |  | $ 800 |  |
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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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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