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Warranties (Tables)
 6 Months Ended
Jun. 27, 2015
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 27,
2015
 
June 28,
2014
 
June 27,
2015
 
June 28,
2014
Balance as of beginning of period
$
3,440

 
$
3,575

 
$
2,953

 
$
3,426

Accruals for warranties issued during period
2,251

 
1,906

 
3,953

 
3,217

Settlements during the period
(1,899
)
 
(1,997
)
 
(3,114
)
 
(3,159
)
Balance as of end of period
$
3,792

 
$
3,484

 
$
3,792

 
$
3,484