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Goodwill (Tables)
 12 Months Ended
Dec. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Goodwill
Changes in the goodwill balance were as follows (in thousands):
 
December 30,
2017
 
December 31,
2016
Goodwill, beginning of period
$
19,780

 
$
20,394

Foreign currency translation adjustment
837

 
(614
)
Goodwill, end of period
$
20,617

 
$
19,780