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Warranty Obligations (Tables)
 3 Months Ended
Apr. 05, 2015
Guarantees [Abstract]  
Changes in Warranty Obligations
The changes in the warranty obligations were as follows (in thousands):
Balance as of December 31, 2014
$
4,494

Provisions for warranties issued during the period
734

Fulfillment of warranty obligations
(608
)
Foreign exchange rate changes
(412
)
Balance as of April 5, 2015
$
4,208