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Warranties (Tables)
 9 Months Ended
Sep. 27, 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
 
Nine Months Ended
 
September 27,
2014
 
September 28,
2013
 
September 27,
2014
 
September 28,
2013
Balance at beginning of the period
$
3,484

 
$
3,519

 
$
3,426

 
$
4,203

Accruals for warranties
1,242

 
1,161

 
4,459

 
2,886

Settlements during the period
(1,736
)
 
(1,278
)
 
(4,895
)
 
(3,687
)
Balance at end of the period
$
2,990

 
$
3,402

 
$
2,990

 
$
3,402