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Product Warranty Reserves (Tables)
 9 Months Ended
Sep. 26, 2015
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 26,
2015
 
September 27,
2014
 
September 26,
2015
 
September 27,
2014
Product warranty reserve at beginning of period
$
2,115

 
$
2,210

 
$
2,214

 
$
1,850

Warranty reserve assumed in business combination
—

 
—

 
—

 
209

Warranty liabilities accrued
1,430

 
1,180

 
4,707

 
3,372

Warranty liabilities settled
(1,880
)
 
(1,266
)
 
(6,682
)
 
(3,715
)
Changes for pre-existing warranty liabilities
616

 
204

 
2,042

 
612

Product warranty reserve at end of period
$
2,281

 
$
2,328

 
$
2,281

 
$
2,328