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Warranty Obligations (Tables)
 6 Months Ended
Jul. 05, 2015
Product Warranties Disclosures [Abstract]  
Changes in Warranty Obligations
The changes in the warranty obligation was as follows (in thousands):
Balance as of December 31, 2014
$
4,086

Provisions for warranties issued during the period
2,851

Fulfillment of warranty obligations
(2,593
)
Foreign exchange rate changes
(341
)
Balance as of July 5, 2015
$
4,003