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Warranty Obligations (Tables)
 9 Months Ended
Sep. 28, 2014
Guarantees [Abstract]  
Changes in Warranty Obligations
The changes in the warranty obligations were as follows (in thousands):
Balance as of December 31, 2013
$
3,016

Provisions for warranties issued during the period
4,012

Fulfillment of warranty obligations
(2,512
)
Foreign exchange rate changes
(218
)
Balance as of September 28, 2014
$
4,298