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Acquisition (Allocation of Consideration) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Aug. 05, 2016
Aug. 04, 2016
Jan. 25, 2016
Dec. 31, 2015
Business Acquisition [Line Items]            
Goodwill $ 209,661 $ 204,794       $ 116,899
Smart Card Software Limited            
Business Acquisition [Line Items]            
Cash         $ 12,056  
Accounts receivable         6,563  
Property and equipment         524  
Other tangible assets         1,462  
Identified intangible assets         59,700  
Goodwill         46,903  
Accounts payable and accrued liabilities         (5,996)  
Deferred income taxes         (15,556)  
Deferred revenue         (1,313)  
Total         $ 104,343  
Inphi Memory Interconnect Business [Member]            
Business Acquisition [Line Items]            
Inventory       $ 6,300    
Property and equipment       4,543    
Other tangible assets       206    
Identified intangible assets       50,222    
Goodwill       32,723    
Accounts payable and accrued liabilities       (3,527)    
Deferred revenue       (467)    
Total       $ 90,000    
Snowbush [Member]            
Business Acquisition [Line Items]            
Property and equipment     $ 911      
Identified intangible assets     25,189      
Goodwill     14,015      
Deferred revenue     (1,270)      
Total     $ 38,845