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Revenue Recognition Policies (Tables)
 9 Months Ended
Sep. 29, 2018
Revenue Recognition Policies  
Schedule of Loss Contingencies by Contingency [Table Text Block]
Distributor sales accrual activity is shown below:

  
Fiscal quarters ended
  
Nine fiscal months ended
  
Years Ended December 31,
 
  
September 29, 2018
  
September 30, 2017
  
September 29, 2018
  
September 30, 2017
  
2017
  
2016
 
Beginning balance
 
$
38,032
  
$
35,733
  
$
36,680
  
$
34,479
  
$
34,479
  
$
32,487
 
Sales allowances
  
27,986
   
22,421
   
77,539
   
67,191
   
89,009
   
86,896
 
Credits issued
  
(29,293
)
  
(28,116
)
  
(77,091
)
  
(71,638
)
  
(87,403
)
  
(85,341
)
Foreign currency
  
103
   
384
   
(300
)
  
390
   
595
   
437
 
Ending balance
 
$
36,828
  
$
30,422
  
$
36,828
  
$
30,422
  
$
36,680
  
$
34,479