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Acquisitions Acquisition (Purchase Price Allocation) (Details) - USD ($)
$ in Thousands
Aug. 23, 2019
Dec. 31, 2019
Dec. 08, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]          
Goodwill   $ 183,465   $ 207,178 $ 209,661
Northwest Logic          
Business Acquisition [Line Items]          
Preliminary purchase price allocation adjustment, goodwill $ 2,100        
Preliminary purchase price allocation adjustment, deferred tax liability 2,100        
Cash and cash equivalents 159        
Accounts receivable 1,679        
Prepaid expenses and other current assets 65        
Operating lease right-of-use assets 178        
Identified intangible assets 8,800        
Goodwill 13,477        
Other asset 9        
Accounts payable (9)        
Operating lease liability (178)        
Other current liabilities (108)        
Deferred tax liability, net (2,133)        
Recognized identifiable assets acquired and liabilities assumed, net $ 21,939        
Silicon IP and Business Protocols Business from Verimatrix          
Business Acquisition [Line Items]          
Prepaid expenses and other current assets     $ 267    
Unbilled receivables     6,765    
Operating lease right-of-use assets     852    
Identified intangible assets     23,500    
Goodwill     16,845    
Deferred revenue     (310)    
Operating lease liability     (852)    
Other current liabilities     (267)    
Recognized identifiable assets acquired and liabilities assumed, net     $ 46,800