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FAIR VALUE (NARRATIVE) (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2022 USD ($) | Apr. 30, 2021 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Apr. 01, 2022 USD ($) | Mar. 31, 2022 USD ($) | Nov. 04, 2020
Business acquisitions, Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit |  |  | $ 960,000 |  | $ 791,000 |  |  |  | $ 960,000 | $ 791,000 |  |  |
Average interest rate on annual borrowings |  |  |  |  |  |  |  |  | 3.10% | 1.30% |  |  |
Business Combination Contingent Consideration Liability |  |  | 5,916 |  | 9,600 |  |  | $ 18,032 | $ 5,916 | $ 9,600 |  |  |
Contingent Consideration Receivable Imputed Interest Benefit and Other Adjustments |  |  |  |  |  |  |  |  | (4,646) |  |  |  |
VoiceFoundry US |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisitions, Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination Contingent Consideration Liability |  |  | $ 0 |  | 7,414 |  |  | 14,085 | $ 0 | 7,414 |  |  |
Increase (decrease) in contingent consideration payable | $ (7,400) | $ (7,400) |  |  | (25) | $ (200) | $ (500) | 3,200 |  |  |  |  |
VoiceFoundry US | Discount Rate |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisitions, Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination contingent consideration measurement input |  |  | 23.1 |  |  |  |  |  | 23.1 |  |  |  |
VoiceFoundry ASEAN |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisitions, Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination Contingent Consideration Liability |  |  | $ 0 |  | 2,186 |  |  | 3,947 | $ 0 | 2,186 |  |  |
Increase (decrease) in contingent consideration payable | $ (2,200) | $ (2,200) |  |  | (100) | 100 | (400) | 1,200 |  |  |  |  |
VoiceFoundry ASEAN | Discount Rate |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisitions, Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination contingent consideration measurement input |  |  | 18.4 |  |  |  |  |  | 18.4 |  |  |  | 18.4
VoiceFoundry Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisitions, Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination Contingent Consideration Liability |  |  |  |  |  |  |  |  |  |  |  | $ 9,600 |
Increase (decrease) in contingent consideration payable |  |  |  |  | 100 | $ 200 | $ 900 | $ 4,300 |  |  |  |  |
Faneuil |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisitions, Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination Contingent Consideration Liability |  |  | $ 5,916 |  | $ 0 |  |  |  | $ 5,916 | $ 0 | $ 8,800 |  |
Increase (decrease) in contingent consideration payable |  |  | $ 500 | $ 2,400 |  |  |  |  |  |  |  |  |
Faneuil | Discount Rate |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisitions, Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination contingent consideration measurement input |  |  | 19.3 |  |  |  |  |  | 19.3 |  |  |  |
Faneuil receivable [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisitions, Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent Consideration Receivable Imputed Interest Benefit and Other Adjustments |  |  | $ (200) | $ (4,400) |  |  |  |  | $ (4,646) |  |  |  |

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