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Warranty Obligations (Tables)
 9 Months Ended
Oct. 04, 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
3,709

Fulfillment of warranty obligations
(3,269
)
Foreign exchange rate changes
(298
)
Balance as of October 4, 2015
$
4,228