Quarterly report pursuant to Section 13 or 15(d)

Business Combinations Business Combination - Exar (Details)

v3.10.0.1
Business Combinations Business Combination - Exar (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
May 12, 2017
Sep. 30, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Adjustments   $ 300  
Goodwill   $ 238,330 $ 237,992
Exar Corporation [Member]      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents $ 235,810    
Exar Corporation [Member] | Cash [Member]      
Business Acquisition [Line Items]      
Business Combination, Consideration Transferred 688,114    
Cash in lieu of equity [Member] | Exar Corporation [Member]      
Business Acquisition [Line Items]      
Business Combination, Consideration Transferred $ 12,700    
Common Stock [Member] | Exar Corporation [Member]      
Business Acquisition [Line Items]      
Business Acquisition, Share Price $ 13.00