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Warranties (Tables)
 3 Months Ended
Mar. 29, 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 with other current liabilities, were as follows (in thousands):
 
 
Three Months Ended
 
March 29,
2014
 
March 30,
2013
Beginning balance
$
3,426

 
$
4,203

    Accruals for warranties issued during period
1,100

 
423

    Aggregate changes in liabilities related to preexisting warranties
217

 
217

    Settlements during the period
(1,168
)
 
(1,188
)
Ending balance
$
3,575

 
$
3,655