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Warranty Obligations (Tables)
 6 Months Ended
Jul. 03, 2016
Product Warranties Disclosures [Abstract]  
Changes in Warranty Obligations
The changes in the warranty obligation were as follows (in thousands):
Balance as of December 31, 2015
$
4,174

Provisions for warranties issued during the period
1,308

Fulfillment of warranty obligations
(1,369
)
Foreign exchange rate changes
89

Balance as of July 3, 2016
$
4,202