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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