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General (Details) - USD ($)
$ in Thousands
1 Months Ended
Jul. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]      
GOODWILL   $ 622,654 $ 504,611
NiceSystems      
Business Acquisition [Line Items]      
Net tangible assets and liabilities assumed (current and non-current) $ (10,287)    
GOODWILL 111,142    
Consideration Transferred 154,382    
Technology | NiceSystems      
Business Acquisition [Line Items]      
Technology $ 31,997    
Expected useful lives 7 years 6 months    
IPR&D | NiceSystems      
Business Acquisition [Line Items]      
Technology $ 714    
Expected useful lives 2 years 6 months    
Customer relationships | NiceSystems      
Business Acquisition [Line Items]      
Technology $ 9,127    
Expected useful lives 8 years 6 months    
Backlog | NiceSystems      
Business Acquisition [Line Items]      
Technology $ 11,689    
Expected useful lives 5 years 6 months