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MARKETABLE SECURITIES
 12 Months Ended
Dec. 26, 2014
Investments, Debt and Equity Securities [Abstract]  
MARKETABLE SECURITIES
MARKETABLE 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.
Gross unrealized gains and losses were de minimis for the years ended December 26, 2014 and December 27, 2013. Our marketable securities have not resulted in any other-than-temporary impairments as of December 26, 2014 or December 27, 2013.