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Warranty Obligations (Tables)
 9 Months Ended
Oct. 02, 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
2,292

Fulfillment of warranty obligations
(2,056
)
Foreign exchange rate changes
134

Balance as of October 2, 2016
$
4,544