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MARKETABLE SECURITIES (Tables)
 6 Months Ended
Jun. 27, 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):
 
June 27, 2014
 
December 27, 2013
 
Amortized Cost
 
Fair Value
 
Amortized Cost
 
Fair Value
Certificates of deposit
$
9,500

 
$
9,496

 
$
10,000

 
$
9,900

Variable-rate demand notes
—

 
—

 
5,750

 
5,750

Commercial paper
—

 
—

 
5,000

 
5,000

 
$
9,500

 
$
9,496

 
$
20,750


$
20,650
Investments Classified by Contractual Maturity Date [Table Text Block]
The amortized cost and fair value by contractual maturity of our marketable securities are as follows (in thousands):
 
June 27, 2014
 
Amortized Cost
 
Fair Value
Due in one year or less (1)
$
5,000

 
$
4,997

Due after one year (2)
4,500

 
4,499

 
$
9,500

 
$
9,496


(1)
Amounts due in one year or less are comprised of CDs.
(2)
Amounts due after one year are comprised of CDs with maturities within two years and are recorded in Other assets on the Consolidated Balance Sheets.
The amortized cost and fair value by contractual maturity of our held-to-maturity investments are as follows (in thousands):
 
June 27, 2014
 
Amortized Cost
 
Fair Value
Due in one year or less
$
11,188

 
$
11,241

Due after one year through five years
43,548

 
44,165

Due after five years through ten years
41,838

 
42,372

 
$
96,574

 
$
97,778