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Warranty Obligations (Tables)
 9 Months Ended
Oct. 01, 2017
Product Warranties Disclosures [Abstract]  
Changes in Warranty Obligations
The changes in the warranty obligation were as follows (in thousands):
Balance as of December 31, 2016
$
4,335

Provisions for warranties issued during the period
2,322

Fulfillment of warranty obligations
(2,323
)
Foreign exchange rate changes
545

Balance as of October 1, 2017
$
4,879