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MARKETABLE SECURITIES (Tables)
12 Months Ended
Dec. 26, 2014
Investments, Debt and Equity Securities [Abstract]  
Schedule of available-for-sale securities
The following tables present the amortized cost and fair value of our marketable securities, which are carried at fair value (in thousands):
 
December 26, 2014
 
December 27, 2013
 
Amortized Cost
 
Fair Value
 
Amortized Cost
 
Fair Value
Certificates of deposit (1)
$
1,500

 
$
1,500

 
$
10,000

 
$
9,900

Variable-rate demand notes

 

 
5,750

 
5,750

Commercial paper

 

 
5,000

 
5,000

 
$
1,500

 
$
1,500

 
$
20,750


$
20,650


(1)
As of December 26, 2014, all our CDs were due within one year. As of December 27, 2013 $14.8 million of our marketable securities were due within one year