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Warranties (Tables)
 6 Months Ended
Jun. 28, 2014
Product Warranties Disclosures [Abstract]  
Components of the warranty accrual
Components of the warranty accrual, which were included in the accompanying condensed consolidated balance sheets within other current liabilities, were as follows (in thousands):
 
 
Three Months Ended
 
Six Months Ended
 
June 28,
2014
 
June 29,
2013
 
June 28,
2014
 
June 29,
2013
Balance at beginning of the period
$
3,575

 
$
3,655

 
$
3,426

 
$
4,203

Accruals for warranties issued during period
913

 
701

 
2,013

 
1,124

Aggregate changes in liabilities related to preexisting warranties
993

 
386

 
1,204

 
603

Settlements during the period
(1,997
)
 
(1,223
)
 
(3,159
)
 
(2,411
)
Balance at end of the period
$
3,484

 
$
3,519

 
$
3,484

 
$
3,519