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FAIR VALUE (NARRATIVE) (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Nov. 04, 2020
Oct. 26, 2019
USD ($)
Business acquisitions, Contingent Consideration [Line Items]                            
Impairment of equity investment                   $ 0 $ 0 $ 15,632,000    
Line of credit $ 385,000,000     $ 290,000,000   $ 385,000,000       $ 385,000,000 $ 290,000,000      
Average interest rate on annual borrowings                   1.60% 3.40%      
Business Combination Contingent Consideration Liability 18,032,000     6,134,000   18,032,000       $ 18,032,000 $ 6,134,000 2,363,000    
Increase (decrease) in contingent consideration payable           (2,500,000) $ 1,100,000 $ 3,300,000 $ 2,400,000          
FCR                            
Business acquisitions, Contingent Consideration [Line Items]                            
Business Combination Contingent Consideration Liability 0     6,134,000   0       $ 0 6,134,000 0   $ 10,900,000
Increase (decrease) in contingent consideration payable $ 1,800,000 $ 1,100,000 $ 3,300,000     $ 1,800,000 $ 1,100,000 $ 3,300,000            
FCR | Discount Rate                            
Business acquisitions, Contingent Consideration [Line Items]                            
Business combination contingent consideration measurement input 16.7         16.7       16.7       16.7
Voice Foundry US                            
Business acquisitions, Contingent Consideration [Line Items]                            
Business Combination Contingent Consideration Liability $ 14,085,000     0   $ 14,085,000       $ 14,085,000 0      
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]                            
Business Combination Contingent Consideration Liability $ 3,947,000     0   $ 3,947,000       $ 3,947,000 0      
Increase (decrease) in contingent consideration payable           $ 1,200,000                
Voice Foundry ASEAN | Discount Rate                            
Business acquisitions, Contingent Consideration [Line Items]                            
Business combination contingent consideration measurement input 18.4         18.4       18.4     18.4  
Voice Foundry Acquisitions                            
Business acquisitions, Contingent Consideration [Line Items]                            
Increase (decrease) in contingent consideration payable           $ 4,300,000                
SCS                            
Business acquisitions, Contingent Consideration [Line Items]                            
Business Combination Contingent Consideration Liability       0             $ 0 $ 2,363,000    
Increase (decrease) in contingent consideration payable       $ 300,000 $ 2,500,000