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Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Accumulated other comprehensive income details
The table below summarizes the changes in accumulated other comprehensive income (loss) by component for the periods indicated (in thousands):
 
 
Three Months Ended
 
 
March 31, 2018
 
April 1, 2017
 
 
Foreign Currency Translation Adjustments
 
Unrealized Gains and Losses on Available-for-Sale Marketable Securities
 
Foreign Currency Translation Adjustments
 
Total
Balance at beginning of period
 
$
(169
)
 
$
(6
)
 
$
(650
)
 
$
(656
)
Other comprehensive income (loss)
 
279

 
(4
)
 
61

 
57

Balance at end of period
 
$
110

 
$
(10
)
 
$
(589
)
 
$
(599
)