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FAIR VALUE (NARRATIVE) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Apr. 01, 2022
USD ($)
Mar. 31, 2022
USD ($)
Business acquisitions, Contingent Consideration [Line Items]            
Line of credit $ 995,000 $ 960,000        
Average interest rate on annual borrowings 6.70% 3.10%        
Business Combination Contingent Consideration Liability $ 1,496 $ 5,916 $ 9,600      
Contingent Consideration Receivable Imputed Interest Benefit and Other Adjustments $ (4,381) (4,646)        
VoiceFoundry US            
Business acquisitions, Contingent Consideration [Line Items]            
Business Combination Contingent Consideration Liability   0 7,414      
VoiceFoundry US | Discount Rate            
Business acquisitions, Contingent Consideration [Line Items]            
Business combination contingent consideration measurement input 23.1          
VoiceFoundry ASEAN            
Business acquisitions, Contingent Consideration [Line Items]            
Business Combination Contingent Consideration Liability   0 2,186      
VoiceFoundry ASEAN | Discount Rate            
Business acquisitions, Contingent Consideration [Line Items]            
Business combination contingent consideration measurement input 18.4          
VoiceFoundry Acquisitions            
Business acquisitions, Contingent Consideration [Line Items]            
Business Combination Contingent Consideration Liability           $ 9,600
Increase (decrease) in contingent consideration payable     1,200 $ 4,300    
Faneuil            
Business acquisitions, Contingent Consideration [Line Items]            
Business Combination Contingent Consideration Liability $ 1,496 5,916 $ 0   $ 8,800  
Increase (decrease) in contingent consideration payable $ (3,000) 2,900        
Faneuil | Discount Rate            
Business acquisitions, Contingent Consideration [Line Items]            
Business combination contingent consideration measurement input 19.3          
Faneuil receivable [Member]            
Business acquisitions, Contingent Consideration [Line Items]            
Contingent Consideration Receivable Imputed Interest Benefit and Other Adjustments $ (4,381) $ (4,646)