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PROPERTY AND EQUIPMENT, NET (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 94,231 $ 85,717  
Accumulated depreciation 67,877 59,514  
Property and equipment, net 26,354 26,203  
Depreciation expenses 9,253 8,163 $ 6,413
Capitalized computer software costs 2,721    
Computer, peripheral equipment and software [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 78,521 71,571  
Accumulated depreciation 59,696 52,645  
Office furniture and equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 10,103 8,953  
Accumulated depreciation 5,382 4,554  
Leasehold improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 5,607 5,193  
Accumulated depreciation $ 2,799 $ 2,315