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Accumulated other comprehensive loss
 12 Months Ended
Dec. 26, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated other comprehensive loss
Accumulated other comprehensive income

A reconciliation of our accumulated balances for each component of other comprehensive income was as follows (in thousands):
 
Defined Benefit
Plan Adjustments
 
 
Currency Translation
Adjustments
 
Unrealized
Holding
Losses
on Securities
 
Total
Balance at December 28, 2012
$
(4,133
)
 
$
24,824

 
$
12

 
$
20,703

Current year changes
(43
)
 
402

 
(5
)
 
354

Balance at December 27, 2013
(4,176
)
 
25,226

 
7

 
21,057

Current year changes
(1,205
)
 
717

 
—

 
(488
)
Balance at December 26, 2014
$
(5,381
)
 
$
25,943

 
$
7

 
$
20,569