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Commitments and Contingencies (Tables)
6 Months Ended
Jun. 29, 2012
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 29,
2012

July 1,
2011
 
June 29,
2012
 
July 1,
2011
 
(in thousands)
 
(in thousands)
Balance, beginning of period
$
5,412


$
5,403

 
$
5,050

 
$
5,561

Payments made or service provided
(669
)

(1,284
)
 
(1,412
)
 
(1,952
)
Warranty expense
788


1,549

 
1,668

 
1,945

Foreign currency translation
(259
)

78

 
(34
)
 
192

Balance, end of period
$
5,272


$
5,746

 
$
5,272

 
$
5,746