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Goodwill and Intangible Assets (Narrative) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Sep. 19, 2016
Finite-Lived Intangible Assets [Line Items]          
Goodwill impairment test discount rate   10.50% 11.00%    
Goodwill impairment test long term growth rate   3.00% 3.00%    
Impairment of intangible assets   $ 43,300,000 $ 41,400,000    
Fairchild [Member]          
Finite-Lived Intangible Assets [Line Items]          
Acquired intangible assets   547,800,000      
Intangible assets acquired   413,600,000     $ 423,400,000
Standard Products Group [Member]          
Finite-Lived Intangible Assets [Line Items]          
Goodwill impairment   0      
Analog Solutions Group [Member]          
Finite-Lived Intangible Assets [Line Items]          
Goodwill impairment       $ 8,700,000  
Impairment of intangible assets       $ 900,000  
Impairment of long-lived assets $ 4,700,000        
In Process Research and Development [Member]          
Finite-Lived Intangible Assets [Line Items]          
Impairment of intangible assets   6,000,000 $ 3,800,000    
IPRD projects reclassified to developed technology   21,600,000      
Image Sensor Group [Member] | In Process Research and Development [Member]          
Finite-Lived Intangible Assets [Line Items]          
Impairment of intangible assets   $ 2,200,000