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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]      
Cost $ 94,414 $ 90,308  
Accumulated depreciation 66,854 61,402  
Depreciated cost 27,560 28,906  
Depreciation expenses 8,389 10,338 $ 11,377
Changes of property and equipment (1,221) (1,013)  
Computers, manufacturing, peripheral equipment [Member]      
Property, Plant and Equipment [Line Items]      
Cost 90,397 86,244  
Accumulated depreciation 63,656 58,469  
Office furniture and equipment [Member]      
Property, Plant and Equipment [Line Items]      
Cost 2,938 2,903  
Accumulated depreciation 2,435 2,084  
Leasehold improvements [Member]      
Property, Plant and Equipment [Line Items]      
Cost 1,079 1,161  
Accumulated depreciation $ 763 $ 849