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FAIR VALUE MEASUREMENT (Details) - USD ($)
$ in Thousands
Jun. 26, 2015
Dec. 26, 2014
Fair Value Measurement [Line Items]    
Other restricted assets [1] $ 11,849 $ 9,972
Restricted investments classified as held-to-maturity 95,198 91,066
Certificate of deposits    
Fair Value Measurement [Line Items]    
Marketable securities classified as available-for-sale [2]   1,500
Carrying Value    
Fair Value Measurement [Line Items]    
Cash and cash equivalents [3] 21,288 19,666
Carrying Value | Restricted Assets    
Fair Value Measurement [Line Items]    
Restricted cash and cash equivalents [3] 58,226 68,359
Other restricted assets [4] 11,849 9,972
Restricted investments classified as held-to-maturity 94,598 90,095
Total Fair Value    
Fair Value Measurement [Line Items]    
Cash and cash equivalents [3] 21,288 19,666
Total Fair Value | Certificate of deposits    
Fair Value Measurement [Line Items]    
Marketable securities classified as available-for-sale [2]   1,500
Total Fair Value | Restricted Assets    
Fair Value Measurement [Line Items]    
Restricted cash and cash equivalents [3] 58,226 68,359
Other restricted assets [4] 11,849 9,972
Restricted investments classified as held-to-maturity 95,198 91,066
Level 1    
Fair Value Measurement [Line Items]    
Cash and cash equivalents [3] 21,288 19,666
Marketable securities classified as available-for-sale [2]   0
Level 1 | Restricted Assets    
Fair Value Measurement [Line Items]    
Restricted cash and cash equivalents [3] 58,226 68,359
Other restricted assets [4] 11,849 9,972
Restricted investments classified as held-to-maturity 0 0
Level 2    
Fair Value Measurement [Line Items]    
Cash and cash equivalents [3] 0 0
Level 2 | Restricted Assets    
Fair Value Measurement [Line Items]    
Restricted cash and cash equivalents [3] 0 0
Other restricted assets [4] 0 0
Restricted investments classified as held-to-maturity 95,198 91,066
Level 3    
Fair Value Measurement [Line Items]    
Cash and cash equivalents [3] 0 $ 0
Marketable securities classified as available-for-sale [2]    
Level 3 | Restricted Assets    
Fair Value Measurement [Line Items]    
Restricted cash and cash equivalents [3] 0 $ 0
Other restricted assets [4] 0 0
Restricted investments classified as held-to-maturity $ 0 $ 0
[1] Primarily consists of deferred compensation plan accounts, which are comprised of mutual funds.
[2] At June 26, 2015 we held no marketable securities. At December 26, 2014, all our marketable securities, which consisted of CDs, had stated maturities of less than one year.
[3] Cash equivalents and restricted cash equivalents consist of money market funds, deposits, and investments with original maturities of three months or less.
[4] Other restricted assets primarily consist of deferred compensation plan accounts, which are comprised of mutual funds.