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Warranties (Tables)
 6 Months Ended
Jun. 28, 2015
Product Warranties Disclosures [Abstract]  
Changes in the warranty reserve
Changes in the warranty reserve for the three- and six-month periods ended June 28, 2015, and June 29, 2014, are as follows: 
 
 
Three Months Ended
 
Six Months Ended
 
 
June 28,
2015
 
June 29,
2014
 
June 28,
2015
 
June 29,
2014
Balance, beginning of period
 
$
375

 
$
324

 
$
355

 
$
379

Changes in product warranties charged to earnings
 
48

 
120

 
199

 
101

Use of reserve for warranty obligations
 
(80
)
 
(116
)
 
(211
)
 
(152
)
Balance, end of period
 
$
343

 
$
328

 
$
343

 
$
328