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Warranties (Tables)
 9 Months Ended
Sep. 26, 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
 
Nine Months Ended
 
September 26,
2015
 
September 27,
2014
 
September 26,
2015
 
September 27,
2014
Balance as of beginning of period
$
3,792

 
$
3,484

 
$
2,953

 
$
3,426

Accruals for warranties issued during period
2,288

 
1,242

 
6,240

 
4,459

Settlements during the period
(1,789
)
 
(1,736
)
 
(4,902
)
 
(4,895
)
Balance as of end of period
$
4,291

 
$
2,990

 
$
4,291

 
$
2,990