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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 27, 2013
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Product Warranty Liability
Changes in the product warranty accrual are summarized as follows:
 
Three months ended
 
Nine months ended
 
September 27,
2013
 
September 28,
2012
 
September 27,
2013

September 28,
2012
 
(in thousands)
Balance, beginning of period
$
5,047

 
$
5,272

 
$
5,098


5,050

Payments made or service provided
(734
)
 
(596
)
 
(2,565
)

(2,008
)
Warranty expense
997

 
718

 
2,838


2,386

Foreign currency translation
93

 
47

 
32


13

Balance, end of period
$
5,403

 
$
5,441

 
$
5,403


$
5,441