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FAIR VALUE (NARRATIVE) (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) | Apr. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2021 USD ($) | Nov. 04, 2020 | Aug. 05, 2020
Business acquisitions, Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit | $ 385,000 |  | $ 805,000 |  |  | $ 385,000 |  |  |  | $ 805,000 |  |
Average interest rate on annual borrowings |  |  | 1.30% |  |  |  |  |  |  |  |  |
Purchase Price Payable Payments During Period |  |  |  |  |  |  |  |  |  | (9,600) |  |
Business Combination Contingent Consideration Liability | 18,032 |  | $ 9,478 |  |  | 18,032 |  |  |  | 9,478 |  |
FCR |  |  |  |  |  |  |  |  |  |  |  |
Business acquisitions, Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in contingent consideration payable |  |  |  |  |  |  | $ (1,800) | $ (1,100) | $ (3,300) |  |  |
VoiceFoundry US |  |  |  |  |  |  |  |  |  |  |  |
Business acquisitions, Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase Price Payable Payments During Period |  |  |  |  |  |  |  |  |  | (7,414) |  |
Business Combination Contingent Consideration Liability | 14,085 |  | 7,390 |  |  | 14,085 |  |  |  | $ 7,390 |  |
Increase (decrease) in contingent consideration payable |  | $ (7,400) | $ (200) |  | $ (500) | (3,200) |  |  |  |  |  |
VoiceFoundry US | Discount Rate |  |  |  |  |  |  |  |  |  |  |  |
Business acquisitions, Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business combination contingent consideration measurement input |  |  | 23.1 |  |  |  |  |  |  | 23.1 |  | 23.1
VoiceFoundry ASEAN |  |  |  |  |  |  |  |  |  |  |  |
Business acquisitions, Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase Price Payable Payments During Period |  |  |  |  |  |  |  |  |  | $ (2,186) |  |
Business Combination Contingent Consideration Liability | 3,947 |  | $ 2,088 |  |  | 3,947 |  |  |  | $ 2,088 |  |
Increase (decrease) in contingent consideration payable |  | $ 2,200 | $ 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 |  |  | $ 9,500 |  |  |  |  |  |  | $ 9,500 |  |
Increase (decrease) in contingent consideration payable | $ 4,300 |  |  | $ 200 | $ 900 |  |  |  |  |  |  |
CafeX [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business acquisitions, Contingent Consideration [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment of equity investment |  |  |  |  |  |  |  |  |  | $ 15,600 |  |

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