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Revenue Recognition Policies (Tables)
 6 Months Ended
Jun. 30, 2018
Revenue Recognition Policies  
Schedule of Loss Contingencies by Contingency [Table Text Block]
Distributor sales accrual activity is shown below:

  
Fiscal quarters ended
  
Six fiscal months ended
  
Years Ended December 31,
 
  
June 30, 2018
  
July 1, 2017
  
June 30, 2018
  
July 1, 2017
  
2017
  
2016
 
Beginning balance
 
$
32,706
  
$
31,952
  
$
36,680
  
$
34,479
  
$
34,479
  
$
32,487
 
Sales allowances
  
25,365
   
23,250
   
49,553
   
44,770
   
89,009
   
86,896
 
Credits issued
  
(19,348
)
  
(20,051
)
  
(47,798
)
  
(43,522
)
  
(87,403
)
  
(85,341
)
Foreign currency
  
(691
)
  
582
   
(403
)
  
6
   
595
   
437
 
Ending balance
 
$
38,032
  
$
35,733
  
$
38,032
  
$
35,733
  
$
36,680
  
$
34,479