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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 29, 2013
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Product Warranty Liability
Changes in the product warranty accrual are summarized as follows:
 
Three months ended
 
March 29,
2013

March 30,
2012
 
(in thousands)
Balance, beginning of period
$
5,098


5,050

Payments made or service provided
(876
)

(743
)
Warranty expense
957


880

Foreign currency translation
(81
)

225

Balance, end of period
$
5,098


$
5,412