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FAIR VALUE MEASUREMENT (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 27, 2014
Dec. 27, 2013
Fair Value Measurement [Line Items]    
Document Period End Date Jun. 27, 2014  
Marketable securities classified as available-for-sale $ 9,496 $ 20,650
Restricted investments classified as held-to-maturity 97,778 86,940
Certificates of deposit
    
Fair Value Measurement [Line Items]    
Marketable securities classified as available-for-sale 9,496 9,900
Marketable securities classified as available-for-sale securities due after one year 4,499  
Certificates of deposit | Other assets
    
Fair Value Measurement [Line Items]    
Marketable securities classified as available-for-sale securities due after one year 4,500 6,000
Carrying Value
    
Fair Value Measurement [Line Items]    
Cash and cash equivalents 162,849 [1] 122,003 [1]
Marketable securities classified as available-for-sale 9,496 [2]  
Carrying Value | Restricted Assets
    
Fair Value Measurement [Line Items]    
Restricted cash and cash equivalents 41,445 [1] 57,085 [1]
Other restricted assets 7,889 [3] 10,795 [3]
Restricted investments classified as held-to-maturity 96,574 86,678
Total Fair Value
    
Fair Value Measurement [Line Items]    
Cash and cash equivalents 162,849 [1] 122,003 [1]
Marketable securities classified as available-for-sale 9,496 [2] 20,650 [2]
Total Fair Value | Restricted Assets
    
Fair Value Measurement [Line Items]    
Restricted cash and cash equivalents 41,445 [1] 57,085 [1]
Other restricted assets 7,889 [3] 10,795 [3]
Restricted investments classified as held-to-maturity 97,778 86,940
Level 1
    
Fair Value Measurement [Line Items]    
Cash and cash equivalents 162,849 [1] 122,003 [1]
Marketable securities classified as available-for-sale 0 [2] 0 [2]
Level 1 | Restricted Assets
    
Fair Value Measurement [Line Items]    
Restricted cash and cash equivalents 41,445 [1] 57,085 [1]
Other restricted assets 7,889 [3] 10,795 [3]
Restricted investments classified as held-to-maturity 0 0
Level 2
    
Fair Value Measurement [Line Items]    
Cash and cash equivalents 0 [1] 0 [1]
Marketable securities classified as available-for-sale 9,496 [2] 20,650 [2]
Level 2 | Restricted Assets
    
Fair Value Measurement [Line Items]    
Restricted cash and cash equivalents 0 [1] 0 [1]
Other restricted assets 0 [3] 0 [3]
Restricted investments classified as held-to-maturity 97,778 86,940
Level 3
    
Fair Value Measurement [Line Items]    
Cash and cash equivalents 0 [1] 0 [1]
Marketable securities classified as available-for-sale 0 [2]    [2]
Level 3 | Restricted Assets
    
Fair Value Measurement [Line Items]    
Restricted cash and cash equivalents 0 [1] 0 [1]
Other restricted assets 0 [3] 0 [3]
Restricted investments classified as held-to-maturity $ 0 $ 0
[1] Cash equivalents and restricted cash equivalents consist of money market funds, deposits, and investments with original maturities of three months or less.
[2] Marketable securities include CDs, VRDNs, and commercial paper, which are classified as available-for-sale. At June 27, 2014 and December 27, 2013, we had $4.5 million and $6.0 million of CDs with maturities greater than one year, which are classified as Other assets on our Consolidated Balance Sheets. VRDNs with contractual maturities beyond one year are classified as short-term based on their highly liquid nature and because they represent the investment of cash that is available for current operations. Despite the long-term nature of their stated contractual maturities, we routinely buy and sell these securities and believe we have the ability to quickly sell them to the re-marketing agent at par value plus accrued interest in the event we decide to liquidate our investment in a particular VRDN.
[3] Other restricted assets primarily consists of deferred compensation plan accounts, which are comprised of mutual funds.