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PROPERTY AND EQUIPMENT, NET (Tables)
12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property and Equipment, Net
     December 31,  
     2017      2016  

Cost:

     

Computers and peripheral equipment

   $ 61,343      $ 58,995  

Office furniture and equipment

     7,934        7,742  

Building

     74,209        60,180  

Leasehold improvements

     10,511        10,554  
  

 

 

    

 

 

 
     153,997        137,471  

Accumulated depreciation

     76,230        75,612  
  

 

 

    

 

 

 

Property and equipment, net

   $ 77,767      $ 61,859