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RESTRICTED CASH AND INVESTMENTS (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2019
USD ($)
security
Sep. 30, 2018
USD ($)
Sep. 29, 2019
USD ($)
security
Sep. 30, 2018
USD ($)
Dec. 30, 2018
USD ($)
security
Restricted Cash and Investments [Line Items]          
Cash collateral held by insurance carriers $ 24,797   $ 24,797   $ 24,182
Cash and cash equivalents held in Trust 23,459   23,459   28,021
Investments held in Trust 147,354   147,354   156,618
Deferred compensation mutual funds 27,859   27,859   23,363
Other restricted cash and cash equivalents 3,574   3,574   3,259
Restricted cash and investments 227,043   227,043   235,443
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]          
Gross Unrealized Gain 3,204   3,204   491
Gross Unrealized Loss (30)   (30)   (1,468)
Fair Value 150,528   150,528   155,641
Estimated fair value          
Less than 12 months 10,594   10,594   36,743
12 months or more 8,110   8,110   68,476
Total 18,704   18,704   105,219
Unrealized losses          
Less than 12 months (14)   (14)   (362)
12 months or more (16)   (16)   (1,106)
Total $ (30)   $ (30)   $ (1,468)
Securities in unrealized loss positions, number of positions | security 19   19   93
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]          
Fair Value $ 150,528   $ 150,528   $ 155,641
Unrealized loss (100)        
Unrealized gain   $ 600 3,100 $ 600  
Municipal debt securities          
Restricted Cash and Investments [Line Items]          
Investments held in Trust 73,358   73,358   76,750
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]          
Gross Unrealized Gain 1,991   1,991   456
Gross Unrealized Loss 0   0   (516)
Fair Value 75,349   75,349   76,690
Estimated fair value          
Less than 12 months 1,692   1,692   12,803
12 months or more 0   0   22,638
Total 1,692   1,692   35,441
Unrealized losses          
Less than 12 months 0   0   (74)
12 months or more 0   0   (442)
Total 0   0   (516)
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]          
Fair Value 75,349   75,349   76,690
Corporate debt securities          
Restricted Cash and Investments [Line Items]          
Investments held in Trust 71,375   71,375   76,310
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]          
Gross Unrealized Gain 1,129   1,129   30
Gross Unrealized Loss (27)   (27)   (908)
Fair Value 72,477   72,477   75,432
Estimated fair value          
Less than 12 months 8,609   8,609   22,567
12 months or more 7,802   7,802   44,463
Total 16,411   16,411   67,030
Unrealized losses          
Less than 12 months (13)   (13)   (277)
12 months or more (14)   (14)   (631)
Total (27)   (27)   (908)
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]          
Fair Value 72,477   72,477   75,432
Agency mortgage-backed securities          
Restricted Cash and Investments [Line Items]          
Investments held in Trust 1,622   1,622   2,559
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]          
Gross Unrealized Gain 21   21   5
Gross Unrealized Loss (3)   (3)   (33)
Fair Value 1,640   1,640   2,531
Estimated fair value          
Less than 12 months 293   293   385
12 months or more 308   308   1,375
Total 601   601   1,760
Unrealized losses          
Less than 12 months (1)   (1)   0
12 months or more (2)   (2)   (33)
Total (3)   (3)   (33)
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]          
Fair Value 1,640   1,640   2,531
U.S. government and agency securities          
Restricted Cash and Investments [Line Items]          
Investments held in Trust 999   999   999
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]          
Gross Unrealized Gain 63   63   0
Gross Unrealized Loss 0   0   (11)
Fair Value 1,062   1,062   988
Estimated fair value          
Less than 12 months         988
12 months or more         0
Total         988
Unrealized losses          
Less than 12 months         (11)
12 months or more         0
Total         (11)
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]          
Fair Value 1,062   1,062   $ 988
Restricted Cash and Investments          
Restricted Cash and Investments [Line Items]          
Investments held in Trust 147,354   147,354    
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]          
Fair Value 150,528   150,528    
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]          
Due in one year or less 21,257   21,257    
Due after one year through five years 86,044   86,044    
Due after five years through ten years 40,053   40,053    
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]          
Due in one year or less 21,277   21,277    
Due after one year through five years 87,712   87,712    
Due after five years through ten years 41,539   41,539    
Fair Value $ 150,528   $ 150,528