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RESTRICTED CASH AND INVESTMENTS (Details) - USD ($)
$ in Thousands
Sep. 23, 2016
Dec. 25, 2015
Restricted Cash and Investments [Line Items]    
Cash collateral held by insurance carriers $ 27,172 $ 23,634
Cash and cash equivalents held in Trust 21,101 26,046
Investments held in Trust 148,811 126,788
Other [1] 15,884 11,944
Restricted cash and investments 212,968 188,412
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Gross Unrealized Gain 3,803 1,644
Gross Unrealized Loss (51) (187)
Fair Value 152,563 128,245
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Fair Value 152,563 128,245
Municipal debt securities    
Restricted Cash and Investments [Line Items]    
Investments held in Trust 72,776 67,948
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Gross Unrealized Gain 2,186 1,345
Gross Unrealized Loss (37) (4)
Fair Value 74,925 69,289
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Fair Value 74,925 69,289
Corporate debt securities    
Restricted Cash and Investments [Line Items]    
Investments held in Trust 69,552 50,462
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Gross Unrealized Gain 1,510 226
Gross Unrealized Loss (13) (152)
Fair Value 71,049 50,536
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Fair Value 71,049 50,536
Agency mortgage-backed securities    
Restricted Cash and Investments [Line Items]    
Investments held in Trust 6,483 8,378
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Gross Unrealized Gain 107 73
Gross Unrealized Loss (1) (31)
Fair Value 6,589 8,420
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Fair Value 6,589 $ 8,420
Restricted Cash and Investments [Member]    
Restricted Cash and Investments [Line Items]    
Investments held in Trust 148,811  
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Fair Value 152,563  
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]    
Due in one year or less 14,051  
Due after one year through five years 76,590  
Due after five years through ten years 58,170  
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Due in one year or less 14,092  
Due after one year through five years 77,854  
Due after five years through ten years 60,617  
Fair Value $ 152,563  
[1] Primarily consists of deferred compensation plan accounts, which are comprised of mutual funds classified as available-for-sale securities.