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Warranties (Tables)
 9 Months Ended
Sep. 29, 2012
Product Warranties Disclosures [Abstract]  
Components of the warranty accrual
 
Three Months Ended
 
Nine Months Ended
 
September 29,
2012
 
October 1,
2011
 
September 29, 2012
 
October 1,
2011
Balance as of beginning of period
$
4,943

 
$
4,242

 
$
4,797

 
$
3,129

Accruals for warranties issued during period
881

 
1,213

 
3,545

 
3,750

Aggregate changes in liabilities related to preexisting warranties
206

 
1,145

 
1,364

 
2,971

Settlements during the period
(1,381
)
 
(1,781
)
 
(5,057
)
 
(5,031
)
Balance as of end of period
$
4,649

 
$
4,819

 
$
4,649

 
$
4,819