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RESTRICTED CASH AND INVESTMENTS (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 26, 2023
Dec. 31, 2023
Restricted Cash and Investments [Line Items]      
Cash collateral held by insurance carriers $ 23,763   $ 23,598
Cash and cash equivalents held in Trust 10,631   12,703
Investments held in Trust 117,109   122,659
Company owned life insurance policies 35,324   32,905
Other restricted cash and cash equivalents 1,142   1,120
Restricted cash and investments 187,969   192,985
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]      
Amortized cost of held-to-maturity investments 117,109   122,659
Gross unrealized gains 217   533
Gross unrealized losses (2,427)   (2,279)
Fair value 114,899   120,913
Held-to-maturity securities, amortized cost [Abstract]      
Amortized cost of held-to-maturity investments 117,109   122,659
Held-to-maturity securities, fair value [Abstract]      
Fair value 114,899   120,913
Unrealized gains (losses) on Investments 2,419 $ 417  
Municipal debt securities      
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]      
Amortized cost of held-to-maturity investments 29,359   32,042
Gross unrealized gains 0   4
Gross unrealized losses (378)   (242)
Fair value 28,981   31,804
Held-to-maturity securities, amortized cost [Abstract]      
Amortized cost of held-to-maturity investments 29,359   32,042
Held-to-maturity securities, fair value [Abstract]      
Fair value 28,981   31,804
Corporate debt securities      
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]      
Amortized cost of held-to-maturity investments 74,318   76,578
Gross unrealized gains 107   333
Gross unrealized losses (1,986)   (1,999)
Fair value 72,439   74,912
Held-to-maturity securities, amortized cost [Abstract]      
Amortized cost of held-to-maturity investments 74,318   76,578
Held-to-maturity securities, fair value [Abstract]      
Fair value 72,439   74,912
Agency mortgage-backed securities      
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]      
Amortized cost of held-to-maturity investments 12,434   13,039
Gross unrealized gains 110   196
Gross unrealized losses (21)   0
Fair value 12,523   13,235
Held-to-maturity securities, amortized cost [Abstract]      
Amortized cost of held-to-maturity investments 12,434   13,039
Held-to-maturity securities, fair value [Abstract]      
Fair value 12,523   13,235
U.S. government and agency securities      
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]      
Amortized cost of held-to-maturity investments 998   1,000
Gross unrealized gains 0   0
Gross unrealized losses (42)   (38)
Fair value 956   962
Held-to-maturity securities, amortized cost [Abstract]      
Amortized cost of held-to-maturity investments 998   1,000
Held-to-maturity securities, fair value [Abstract]      
Fair value 956   $ 962
Restricted cash and investments      
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]      
Amortized cost of held-to-maturity investments 117,109    
Fair value 114,899    
Held-to-maturity securities, amortized cost [Abstract]      
Due in one year or less 26,700    
Due after one year through five years 75,500    
Due after five years through ten years 8,520    
Due after ten years 6,389    
Amortized cost of held-to-maturity investments 117,109    
Held-to-maturity securities, fair value [Abstract]      
Due in one year or less 26,204    
Due after one year through five years 73,719    
Due after five years through ten years 8,505    
Due after ten years 6,471    
Fair value $ 114,899