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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 26, 2014
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 26,
2014
 
September 27,
2013
 
September 26,
2014

September 27,
2013
 
(in thousands)
Balance, beginning of period
$
4,946

 
$
5,047

 
$
5,326


5,098

Payments made or service provided
(754
)
 
(734
)
 
(2,309
)

(2,565
)
Warranty expense
692

 
997

 
1,867


2,838

Foreign currency translation
(88
)
 
93

 
(88
)

32

Balance, end of period
$
4,796

 
$
5,403

 
$
4,796


$
5,403