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Product Warranty Reserves (Tables)
 9 Months Ended
Sep. 24, 2016
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 24,
2016
 
September 26,
2015
 
September 24,
2016
 
September 26,
2015
Product warranty reserve at beginning of period
$
2,214

 
$
2,115

 
$
2,159

 
$
2,214

Warranty liabilities accrued
1,537

 
1,430

 
4,574

 
4,707

Warranty liabilities settled
(1,583
)
 
(1,880
)
 
(5,128
)
 
(6,682
)
Changes for pre-existing warranty liabilities
(45
)
 
616

 
518

 
2,042

Product warranty reserve at end of period
$
2,123

 
$
2,281

 
$
2,123

 
$
2,281