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Segment Information (Tables)
9 Months Ended
Sep. 30, 2017
Segment Information [Abstract]  
Schedule of Segment Reporting Information, by Segment
The following tables set forth business segment information:

  
MOSFETs
  
Diodes
  
Optoelectronic Components
  
Resistors & Inductors
  
Capacitors
  
Total
 
Fiscal quarter ended September 30, 2017:
                  
Product Sales
 
$
126,522
  
$
160,711
  
$
76,740
  
$
217,593
  
$
96,309
  
$
677,875
 
Royalty Revenues
  
-
   
-
   
-
   
8
   
-
  
$
8
 
Total Revenue
 
$
126,522
  
$
160,711
  
$
76,740
  
$
217,601
  
$
96,309
  
$
677,883
 
                         
Gross Profit
 
$
32,307
  
$
42,942
  
$
28,901
  
$
65,541
  
$
19,582
  
$
189,273
 
                         
Segment Operating Income
 
$
23,391
  
$
37,991
  
$
25,012
  
$
58,267
  
$
14,688
  
$
159,349
 
                         
Fiscal quarter ended October 1, 2016:
                        
Product Sales
 
$
101,687
  
$
141,127
  
$
72,801
  
$
191,989
  
$
84,299
  
$
591,903
 
Royalty Revenues
  
-
   
-
   
-
   
52
   
-
  
$
52
 
Total Revenue
 
$
101,687
  
$
141,127
  
$
72,801
  
$
192,041
  
$
84,299
  
$
591,955
 
                         
Gross Profit
 
$
16,443
  
$
36,444
  
$
24,250
  
$
58,768
  
$
17,996
  
$
153,901
 
                         
Segment Operating Income
 
$
7,493
  
$
31,832
  
$
20,340
  
$
51,861
  
$
13,210
  
$
124,736
 
 
Nine fiscal months ended September 30, 2017:
                
Product Sales
 
$
346,086
  
$
461,323
  
$
216,260
  
$
627,116
  
$
278,198
  
$
1,928,983
 
Royalty Revenues
  
-
   
-
   
-
   
50
   
-
  
$
50
 
Total Revenue
 
$
346,086
  
$
461,323
  
$
216,260
  
$
627,166
  
$
278,198
  
$
1,929,033
 
                         
Gross Profit
 
$
78,298
  
$
121,601
  
$
76,668
  
$
188,801
  
$
57,743
  
$
523,111
 
                         
Segment Operating Income
 
$
51,789
  
$
106,906
  
$
63,401
  
$
166,852
  
$
42,988
  
$
431,936
 
                         
Nine fiscal months ended October 1, 2016: 
                    
Product Sales
 
$
304,839
  
$
418,629
  
$
203,635
  
$
568,122
  
$
257,175
  
$
1,752,400
 
Royalty Revenues
  
-
   
-
   
-
   
212
   
-
  
$
212
 
Total Revenue
 
$
304,839
  
$
418,629
  
$
203,635
  
$
568,334
  
$
257,175
  
$
1,752,612
 
                         
Gross Profit
 
$
40,914
  
$
106,364
  
$
65,049
  
$
171,808
  
$
53,203
  
$
437,338
 
                         
Segment Operating Income
 
$
12,671
  
$
90,025
  
$
49,838
  
$
147,315
  
$
37,145
  
$
336,994
 

Reconciliation of Operating Profit (Loss) from Segments to Consolidated

  
Fiscal quarters ended
  
Nine fiscal months ended
 
  
September 30, 2017
  
October 1, 2016
  
September 30, 2017
  
October 1, 2016
 
Reconciliation:
            
Segment Operating Income
 
$
159,349
  
$
124,736
  
$
431,936
  
$
336,994
 
Restructuring and Severance Costs
  
(3,244
)
  
(1,197
)
  
(5,194
)
  
(12,139
)
Impairment of Intangible Assets
  
-
   
(1,559
)
  
-
   
(1,559
)
Unallocated Selling, General, and Administrative Expenses
  
(63,777
)
  
(64,751
)
  
(187,690
)
  
(176,111
)
Consolidated Operating Income
 
$
92,328
  
$
57,229
  
$
239,052
  
$
147,185
 
Unallocated Other Income (Expense)
  
(6,140
)
  
(6,545
)
  
(26,713
)
  
(11,649
)
Consolidated Income (Loss) Before Taxes
 
$
86,188
  
$
50,684
  
$
212,339
  
$
135,536