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FAIR VALUE (NARRATIVE) (Details)
$ in Thousands
1 Months Ended 3 Months Ended
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Apr. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Nov. 04, 2020
Aug. 05, 2020
Business acquisitions, Contingent Consideration [Line Items]                  
Line of credit $ 339,000 $ 385,000       $ 339,000 $ 385,000    
Average interest rate on annual borrowings           1.10%      
Purchase Price Payable Payments During Period           $ 0      
Business Combination Contingent Consideration Liability 18,909 18,032       18,909 18,032    
FCR                  
Business acquisitions, Contingent Consideration [Line Items]                  
Increase (decrease) in contingent consideration payable     $ 1,100 $ 3,300          
Voice Foundry US                  
Business acquisitions, Contingent Consideration [Line Items]                  
Purchase Price Payable Payments During Period           0      
Business Combination Contingent Consideration Liability $ 14,566 14,085       14,566 14,085    
Increase (decrease) in contingent consideration payable         $ (7,400) $ (500) (3,200)    
Voice Foundry US | Discount Rate                  
Business acquisitions, Contingent Consideration [Line Items]                  
Business combination contingent consideration measurement input 23.1         23.1     23.1
Voice Foundry ASEAN                  
Business acquisitions, Contingent Consideration [Line Items]                  
Purchase Price Payable Payments During Period           $ 0      
Business Combination Contingent Consideration Liability $ 4,343 3,947       4,343 3,947    
Increase (decrease) in contingent consideration payable         $ 2,200 $ (400) $ (1,200)    
Voice Foundry ASEAN | Discount Rate                  
Business acquisitions, Contingent Consideration [Line Items]                  
Business combination contingent consideration measurement input 18.4         18.4   18.4  
Voice Foundry Acquisitions                  
Business acquisitions, Contingent Consideration [Line Items]                  
Business Combination Contingent Consideration Liability $ 18,900         $ 18,900      
Increase (decrease) in contingent consideration payable $ 900 $ 4,300              
CafeX [Member]                  
Business acquisitions, Contingent Consideration [Line Items]                  
Impairment of equity investment           $ 15,600