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Income Taxes (Tables)
 3 Months Ended
Mar. 24, 2018
Income Tax Disclosure [Abstract]  
Reserves Rollforward
A reconciliation of unrecognized tax benefits is as follows: 
 
3/24/2018

 
12/30/2017

Balance, beginning of year
$
2,212

 
$
1,885

Additions for tax positions related to the current year
52

 
309

Additions for tax positions from prior years
5

 
86

Reductions for tax positions from prior years
—

 
(51
)
Settlement payments
—

 
(4
)
Statutes of limitations expiration
(14
)
 
(33
)
Translation and other
16

 
20

Balance, end of period
$
2,271

 
$
2,212