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GENERAL - Narrative (Details)
$ in Thousands
12 Months Ended
Jun. 17, 2021
USD ($)
Aug. 18, 2020
USD ($)
Dec. 31, 2021
USD ($)
market
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]          
Number of main markets | market     2    
Goodwill     $ 1,606,756 $ 1,503,252 $ 1,378,418
Acquisition costs     1,761 1,720 720
ContactEngine          
Business Acquisition [Line Items]          
Consideration transferred in acquisition $ 94,897        
Goodwill 69,593        
ContactEngine | Core Technology          
Business Acquisition [Line Items]          
Intangible assets acquired in a business combination $ 20,558        
Estimated useful life 5 years        
ContactEngine | Customer relationships          
Business Acquisition [Line Items]          
Intangible assets acquired in a business combination $ 3,279        
Estimated useful life 6 years        
ContactEngine | Customer backlog          
Business Acquisition [Line Items]          
Intangible assets acquired in a business combination $ 5,493        
Estimated useful life 2 years        
Series of Individually Immaterial Business Acquisitions          
Business Acquisition [Line Items]          
Consideration transferred in acquisition     59,317 50,686  
Intangible assets acquired in a business combination     20,036 22,968  
Goodwill     $ 38,590 $ 54,869 14,480
Percent of share capital acquired     70.10% 50.10%  
Fair value of non-controlling interests       $ 24,985  
Business combination and asset acquisition consideration transferred         26,671
Intangible assets identified         $ 15,683
Guardian Analytics, Inc.          
Business Acquisition [Line Items]          
Consideration transferred in acquisition   $ 113,921      
Goodwill   65,888      
Guardian Analytics, Inc. | Core Technology          
Business Acquisition [Line Items]          
Intangible assets acquired in a business combination   $ 38,341      
Estimated useful life   6 years      
Guardian Analytics, Inc. | Customer relationships          
Business Acquisition [Line Items]          
Intangible assets acquired in a business combination   $ 6,659      
Estimated useful life   8 years      
Guardian Analytics, Inc. | Customer backlog          
Business Acquisition [Line Items]          
Intangible assets acquired in a business combination   $ 1,028      
Estimated useful life   2 years