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Warranties (Tables)
 6 Months Ended
Jun. 29, 2013
Product Warranties Disclosures [Abstract]  
Components of the warranty accrual
Components of the warranty accrual, which were included in the accompanying condensed consolidated balance sheets with other current liabilities, were as follows (in thousands):
 
 
Three Months Ended
 
Six Months Ended
 
June 29, 2013
 
June 30, 2012
 
June 29, 2013
 
June 30, 2012
Balance as of beginning of period
$
3,655

 
$
4,923

 
$
4,203

 
$
4,797

Accruals for warranties issued during period
701

 
1,192

 
1,124

 
2,664

Aggregate changes in liabilities related to preexisting warranties
386

 
548

 
603

 
1,158

Settlements during the period
(1,223
)
 
(1,720
)
 
(2,411
)
 
(3,676
)
Balance as of end of period
$
3,519

 
$
4,943

 
$
3,519

 
$
4,943