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Product Warranty Reserves (Tables)
 6 Months Ended
Jun. 25, 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
 
Six Months Ended
 
June 25,
2016
 
June 27,
2015
 
June 25,
2016
 
June 27,
2015
Product warranty reserve at beginning of period
$
2,168

 
$
2,545

 
$
2,159

 
$
2,214

Warranty liabilities accrued
1,685

 
1,469

 
3,037

 
3,277

Warranty liabilities settled
(1,785
)
 
(2,814
)
 
(3,545
)
 
(4,802
)
Changes for pre-existing warranty liabilities
146

 
915

 
563

 
1,426

Product warranty reserve at end of period
$
2,214

 
$
2,115

 
$
2,214

 
$
2,115