Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets Goodwill and Intangibles Other (Details 2)

v3.8.0.1
Goodwill and Intangible Assets Goodwill and Intangibles Other (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
May 12, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Indefinite-lived Intangible Assets [Line Items]        
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months   $ 68,041    
Other Indefinite-lived Intangible Assets     $ 22,400 $ 3,200
Impairment of Intangible Assets (Excluding Goodwill)   (2,000)    
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)   2,000 1,300 21,600
Finite-Lived Intangible Assets, Amortization Expense, Year Two   57,191    
Finite-Lived Intangible Assets, Amortization Expense, Year Three   56,325    
2019   55,542    
2020   38,012    
Finite-Lived Intangible Assets, Amortization Expense, after Year Five   35,534    
Finite-Lived Intangible Assets, Net   310,645 81,861 48,155
Exar Corporation [Member]        
Indefinite-lived Intangible Assets [Line Items]        
Identifiable intangible assets $ 249,500      
Entropic Communications [Member]        
Indefinite-lived Intangible Assets [Line Items]        
Indefinite-lived Intangible Assets, Purchase Accounting Adjustments     23,600  
Entropic Communications [Member]        
Indefinite-lived Intangible Assets [Line Items]        
Impairment of Intangible Assets (Excluding Goodwill)       (17,800)
Physpeed [Member]        
Indefinite-lived Intangible Assets [Line Items]        
Impairment of Intangible Assets (Excluding Goodwill)       (3,800)
In Process Research and Development [Member]        
Indefinite-lived Intangible Assets [Line Items]        
Intangible Assets, Transfer from IPRD to Developed Tech   (32,600) (3,100)  
In Process Research and Development [Member] | Exar Corporation [Member]        
Indefinite-lived Intangible Assets [Line Items]        
Indefinite-lived Intangible Assets, Purchase Accounting Adjustments $ 16,600 16,600    
Indefinite-lived Intangible Assets [Member]        
Indefinite-lived Intangible Assets [Line Items]        
Other Indefinite-lived Intangible Assets   $ 4,400    
Impairment of Intangible Assets (Excluding Goodwill)     $ (1,300) $ (21,600)