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BUSINESS COMBINATION (Identifiable finite-lived intangible assets) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Feb. 23, 2016
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
Trade names      
Business Acquisition [Line Items]      
Weighted Average Useful Life 3 years    
Fair value inputs, discount rate 10.00%    
Customer relationships      
Business Acquisition [Line Items]      
Weighted Average Useful Life 9 years    
Fair value inputs, discount rate 10.00%    
Backlog      
Business Acquisition [Line Items]      
Weighted Average Useful Life 1 year    
Fair value inputs, discount rate 8.00%    
Developed technology      
Business Acquisition [Line Items]      
Recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles   $ 4,200  
Weighted Average Useful Life   3 years  
Fair value inputs, discount rate 9.00%    
Developed technology | Minimum      
Business Acquisition [Line Items]      
Weighted Average Useful Life 4 years    
Developed technology | Maximum      
Business Acquisition [Line Items]      
Weighted Average Useful Life 6 years    
In-process research and development      
Business Acquisition [Line Items]      
Fair value inputs, discount rate 12.00%    
IPR&D projects     1
Estimated cost to complete in process research and development $ 22,300    
EZchip      
Business Acquisition [Line Items]      
Intangible assets 288,246    
EZchip | Trade names      
Business Acquisition [Line Items]      
Recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles 5,600    
EZchip | Customer relationships      
Business Acquisition [Line Items]      
Recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles 56,400    
EZchip | Backlog      
Business Acquisition [Line Items]      
Recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles 11,300    
EZchip | Developed technology      
Business Acquisition [Line Items]      
Recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles 181,246    
EZchip | In-process research and development      
Business Acquisition [Line Items]      
Recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles $ 33,700