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Product Warranty Reserves (Tables)
 9 Months Ended
Sep. 30, 2017
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Liability [Table Text Block]
The following is a summary of the Company's product warranty activity:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
2017
 
September 24,
2016
 
September 30,
2017
 
September 24,
2016
Product warranty reserve at beginning of period
$
2,145

 
$
2,214

 
$
2,307

 
$
2,159

Warranty liabilities accrued
1,453

 
1,537

 
4,365

 
4,574

Warranty liabilities settled
(1,394
)
 
(1,583
)
 
(4,365
)
 
(5,128
)
Changes for pre-existing warranty liabilities
(48
)
 
(45
)
 
(151
)
 
518

Product warranty reserve at end of period
$
2,156

 
$
2,123

 
$
2,156

 
$
2,123