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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 28, 2013
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Product Warranty Liability
Changes in the product warranty accrual are summarized as follows:
 
Three months ended
 
Six months ended
 
June 28,
2013
 
June 29,
2012
 
June 28,
2013

June 29,
2012
 
(in thousands)
Balance, beginning of period
$
5,098

 
$
5,412

 
$
5,098


5,050

Payments made or service provided
(955
)
 
(669
)
 
(1,831
)

(1,412
)
Warranty expense
884

 
788

 
1,841


1,668

Foreign currency translation
20

 
(259
)
 
(61
)

(34
)
Balance, end of period
$
5,047

 
$
5,272

 
$
5,047


$
5,272