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GENERAL (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended 2 Months Ended 12 Months Ended
Nov. 14, 2016
Mar. 11, 2016
Mar. 22, 2016
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sep. 18, 2015
Jul. 01, 2015
Business Acquisition [Line Items]                  
Goodwill from acquisitions         $ 24,346 [1] $ 651,892 [2]      
Goodwill       $ 1,284,710 1,318,242 1,284,710 $ 651,112    
Acquisition costs         970 9,348    
Net operating losses carryforward       $ 82,243 79,196 82,243      
Depreciation expense         0 0 724    
Amortization expense         0 $ 0 4,362    
Cyber and Intelligence operation [Member]                  
Business Acquisition [Line Items]                  
Total consideration of sale                 $ 151,583
Cash in sale                 111,583
Earn out based on future business performance                 $ 40,000
Capital gain             101,847    
Physical Security operation [Member]                  
Business Acquisition [Line Items]                  
Total consideration of sale               $ 92,475  
Cash in sale               74,551  
Note receivable               2,924  
Earn out based on future business performance               15,000  
Capital gain             $ 45,487    
Amount of goodwill               $ 35,554  
Business Acquisitions [Member]                  
Business Acquisition [Line Items]                  
Consideration transferred in acquisition         76,870        
Total assets acquired         2,291        
Total liabilities assumed         51,015        
Goodwill         28,145        
inContact [Member]                  
Business Acquisition [Line Items]                  
Goodwill from acquisitions $ 559,372       $ 559,372        
Consideration transferred in acquisition 1,050,054                
Total assets acquired 1,240,678                
Total liabilities assumed 190,624                
Goodwill 559,372                
Conversion of inContact Notes 139,438                
Cash out options and Restricted shares $ 25,366                
Dividend yield 0.00%                
Percentage of consolidated total assets constituted by acquired entity       4.20%   4.20%      
Percentage of consolidated net income constituted by acquired entity from acquisition date       1.20%          
inContact [Member] | Minimum [Member]                  
Business Acquisition [Line Items]                  
Expected life 12 months                
Risk-free interest rate 0.58%                
Expected volatility 21.05%                
inContact [Member] | Maximum [Member]                  
Business Acquisition [Line Items]                  
Expected life 74 months                
Risk-free interest rate 1.22%                
Expected volatility 25.92%                
Nexidia [Member]                  
Business Acquisition [Line Items]                  
Consideration transferred in acquisition     $ 135,150            
Total assets acquired     156,892            
Total liabilities assumed     21,742            
Goodwill     $ 75,647            
Voiceprint International, Inc [Member]                  
Business Acquisition [Line Items]                  
Goodwill from acquisitions   $ 16,873              
Customer relationships   8,500              
Consideration transferred in acquisition   $ 21,720              
Expected life   6 years              
[1] Includes a reduction of $3,799 of goodwill in respect of 2016 acquisition resulted from a finalization of purchase price allocation.
[2] including a goodwill balance of $559,372 related to the acquisition of inContact.