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MARKETABLE SECURITIES - Available-for-sale Securities by Contractual Maturity (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 27, 2014
Dec. 27, 2013
Jun. 27, 2014
Certificates of deposit
Dec. 27, 2013
Certificates of deposit
Jun. 27, 2014
Maximum
Certificates of deposit
Available-for-sale Securities, Amortized Cost          
Due in one year or less     $ 5,000    
Due after one year     4,500    
Total 9,500 20,750 9,500 10,000  
Available-for-sale Securities, Fair Value          
Due in one year or less     4,997    
Due after one year     4,499    
Total $ 9,496 $ 20,650 $ 9,496 $ 9,900  
Available-for-sale Securities, Debt Maturities, after One Year, Maturity Term         2 years