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Note 2 - Acquisitions - Preliminary Price Allocation (Details) - USD ($)
$ in Thousands
9 Months Ended
Jul. 07, 2017
Mar. 01, 2017
Feb. 28, 2017
Aug. 29, 2016
Apr. 04, 2016
Mar. 25, 2016
Sep. 30, 2017
Oct. 01, 2016
Dec. 31, 2016
Goodwill             $ 451,131   $ 403,544
Cash, net of cash acquired             38,610 $ 468,636  
Fair value of commitment to purchase non-controlling interest             $ 9,000  
U.S. Sensor [Member]                  
Cash $ 24,439                
Current assets, net 4,755                
Goodwill 16,054                
Current liabilities (540)                
24,439                
U.S. Sensor [Member] | Patented and Unpatented Technologies [Member]                  
Intangible assets, other than goodwill 1,090                
U.S. Sensor [Member] | Customer Relationships [Member]                  
Intangible assets, other than goodwill 2,830                
U.S. Sensor [Member] | Trademarks and Trade Names [Member]                  
Intangible assets, other than goodwill 200                
U.S. Sensor [Member] | Noncompete Agreements [Member]                  
Intangible assets, other than goodwill $ 50                
Monolith [Member]                  
Current assets, net   $ 891              
Goodwill   20,641              
Current liabilities   (639)              
Original investment   3,500 $ 3,500            
Cash, net of cash acquired   14,172              
Fair value of commitment to purchase non-controlling interest   9,000              
Total purchase consideration   26,672              
Property, plant, and equipment   789              
Other non-current liabilities   (1,870)              
  26,672              
Total purchase consideration     $ 15,000            
Monolith [Member] | Patented and Unpatented Technologies [Member]                  
Intangible assets, other than goodwill   6,720              
Monolith [Member] | Noncompete Agreements [Member]                  
Intangible assets, other than goodwill   $ 140              
ON Portfolio [Member]                  
Cash       $ 104,000          
Current assets, net       4,816          
Goodwill       56,084          
      104,000          
Total purchase consideration       104,000          
ON Portfolio [Member] | Patented and Unpatented Technologies [Member]                  
Intangible assets, other than goodwill       8,800          
ON Portfolio [Member] | Customer Relationships [Member]                  
Intangible assets, other than goodwill       31,800          
ON Portfolio [Member] | Noncompete Agreements [Member]                  
Intangible assets, other than goodwill       $ 2,500          
Menber's S.p.A. [Member]                  
Current assets, net         $ 12,919        
Goodwill         8,091        
Current liabilities         (7,220)        
        19,162        
Cash, net of cash acquired         19,162        
Property, plant, and equipment         1,693        
Other non-current liabilities         (1,444)        
Total purchase consideration         19,200        
Menber's S.p.A. [Member] | Patented and Unpatented Technologies [Member]                  
Intangible assets, other than goodwill         224        
Menber's S.p.A. [Member] | Customer Relationships [Member]                  
Intangible assets, other than goodwill         3,050        
Menber's S.p.A. [Member] | Trademarks and Trade Names [Member]                  
Intangible assets, other than goodwill         $ 1,849        
PolySwitch [Member]                  
Current assets, net           $ 60,228      
Goodwill           165,088      
Current liabilities           (35,280)      
          348,292      
Property, plant, and equipment           51,613      
Other non-current liabilities           (5,020)      
Original consideration           350,000      
Post closing consideration adjustment received           (1,708)      
Acquired cash           (3,810)      
Acquired cash returned to seller           3,810      
Total purchase consideration           348,292      
Land lease           4,290      
Other long-term assets           11,228      
PolySwitch [Member] | Patented and Unpatented Technologies [Member]                  
Intangible assets, other than goodwill           56,425      
PolySwitch [Member] | Customer Relationships [Member]                  
Intangible assets, other than goodwill           $ 39,720